Currently, the most solid pieces of evidence come from aircraft and spacecraft. The photos over a large enough area of the ground taken from airplanes cannot fit together on a flat surface, but do fit on a roughly spherical one. Photos taken from high-flying aircraft also show the curvature of the horizon. Note that this curvature is unlikely to be observed on low-flying planes and commercial airliners, and the curvature seen in these photos is more likely due to the distortion of windows and camera lenses.
From a low Earth orbit, the curvature of the Earth is obvious. Satellites in higher orbits can take photos of half of the planet, which is spherical. The astronauts of the Apollo Program even got to see the sphere rotate.
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