Did Buddha told anything about if we can travel to the end of the cosmos? Did the Buddha tell us anything about reaching the end of the cosmos or time-travel through the means of experiencing all the Jhanas in meditation?
We know of no sutra directly bearing on the subject of time travel, although space travel to the akasha deva loka ("space world of shining ones") is frequently met with in both directions, Sakka to Earth and the Buddha and monastics to many "celestial" worlds [like the Buddha, Maha Moggallana, and other disciples going into near Earth orbit and battling a reptilian or naga named Nandopananda). But there is one oddity we never stop pointing out: 

During WW II the Germans developed a time travel "bell" (Die Glocke), which just happens to look exactly like the strange hollow stupas, reliquary mounds or "bells" housing Buddha figures at the largest Buddhist site in the world -- Borobudur, Central Java, Indonesia -- with its massive, pyramid-like platforms. The structure is the size of a mountain in what is now an Islamic.



So marvelous and inexplicable to the Muslims was this site that they tried to destroy it but could not. Nor could they build anything to rival it; they simply did not have the technology. Instead, they buried it in a massive pile of mud. More than a century later, when the British archeologists were surveying the site, one realized that there was no way there could be a "mountain" there. He had his workers dig, and he is credited with rediscovering a Buddhist temple complex larger than the massive pieces in Bamiyan, Afghanistan (although the unexcavated Mes Aynak site may rival Borobudur, but if Chinese mining interests have their way, it will be destroyed first) and Angkor Wat, Cambodia.

The Germans were given off-planet instructions on how to construct a transporter, which they dubbed "The Bell" (Die Glocke), and tested it. They sent it into the future and retrieved, weather beaten a short time later. What else they did is kept top secret by the OSI, CIA, NASA, and other American organizations which inherited and protected German scientists after the war, such as Robert Oppenheimer and Nazi Wernher von Braun.

[Edited]. In Buddhism philosophy there is also Kalachakra Mandala which also look like Borobudur Temple.  

Meaning of Kalachakra Mandala : The word kalachakra means cycles of time, and the Kalachakra system presents three such cycles – external, internal and alternative. The external and internal cycles deal with time as we normally know it, while the alternative cycles are practices for gaining liberation from these two.
What is the Kalachakra?.  

Many articles are there explained about Kalachakra Manadala.
There also explained about cosmos and about five strings of attachments.  

[Edited]. 


  Once the Blessed One [the Buddha, who was known as the Teacher of Devas and Humans] was staying near Savatthi, in Jeta's Grove, at Anathapindika's monastery. Then the male deva Rohitassa, late at night, with his splendid radiance lighting up the entire grove, went to the Blessed One, bowed, respectfully stood to one side, and asked:
  
  
    "Venerable sir, is it possible by traveling to know or see or reach the far end of the universe where one does not undergo rebirth, aging, dying, passing away, or reappearing?"  
    
    "I tell you, friend, that it is not possible by traveling to know or see or reach the far end of the universe where one does not undergo rebirth, aging, dying, passing away, or reappearing."
    
    "It is amazing, venerable sir, it is awe-inspiring, how well this has been said by the Blessed One! ...Once I was a seer (Indian rishi, yogi) named Rohitassa, a disciple of [the Guru] Bhoja, a powerful sky-walker. My speed was as fast as that of a strong archer -- well-trained, a practiced hand, a practiced sharp-shooter -- shooting a light arrow across the shadow of a palm tree. [This is a common idiom to illustrate extreme speed in ancient India, the time it would take a shot arrow to pass the shadow of a tree.] My stride stretched as far as the East Sea is from the West [the width of India]. To me, endowed with such speed, such a stride, there arose the desire: 'I will go traveling to the end of the universe.'
    
    "I with a 100 year life, a 100 year span spent 100 years traveling. And apart from the time spent eating, drinking, savoring, urinating, defecating, and sleeping to ward off weariness. But without reaching the end of the universe, I died along the way. So it is amazing, venerable sir, it is awesome, how well this has been said by the Blessed One!"
  
  
  [The Buddha replied:]
  
  
    "I tell you, friend, that it is not possible by traveling to know or see or reach the far end of the universe... But at the same time, I tell you that there is no making an end of disappointment and suffering without reaching the end of the universe (world).
    It is just within this fathom-long body, with its perception and intellect, that I declare that:
    
    
    There is the universe (world), 
    The origination of the universe,
    The cessation of the universe, and
    The path of practice leading to the cessation of the universe." [This is another wording of the ennobling Four Noble Truths.]
    
    
    "It is not to be reached by traveling [in space]. AND it is not without reaching the end of the universe that there is release from disappointment and suffering. 
    
    "So truly the wise one, an expert with regard to the cosmos, a knower of the end of the cosmos, having fulfilled the holy life, calmed, knowing the cosmos' end, doesn't long for this cosmos or for any other."
  
  
  
  (See also AN 9.38). 
  


So even if they found that Die Glocke were look like Borobudur temple.
Buddha said all about it is cosmos.


  "These five strings of sensuality are, in the discipline of the noble ones, called the cosmos.  
  
  Which five? Forms cognizable via the eye — agreeable, pleasing, charming, endearing, fostering desire, enticing; sounds cognizable via the ear... aromas cognizable via the nose... flavors cognizable via the tongue... tactile sensations cognizable via the body — agreeable, pleasing, charming, endearing, fostering desire, enticing. These are the five strings of sensuality that, in the discipline of the noble ones, are called the cosmos. AN 9.38