It is housed in a Martello A series of such towers, some 12 m (40 ft) high and 2.5 m (8 ft) thick, were constructed along the coast at the beginning of the 19th century to guard against invasion by Napoleon.
( ( It ( is ( housed ( in ( ( a ( Martello ( A series ) ) ) ( of ( such towers ) ) ) ) ) ) ) ( , ( ( ( ( ( ( some ( ( 12 m ) ( ( -LRB- ( ( 40 ft ) -RRB- ) ) high ) ) ) and ) ( 2.5 ( m ( -LRB- ( ( 8 ft ) -RRB- ) ) ) ) ) thick ) , ) ( ( were ( ( constructed ( along ( ( the coast ) ( at ( ( the beginning ) ( of ( the ( 19th century ) ) ) ) ) ) ) ) ( to ( ( guard ( against invasion ) ) ( by Napoleon ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (PRP It)) (VP (VBZ is) (VP (VBN housed) (PP (IN in) (NP (NP (DT a) (NNP Martello) (NNP A) (NN series)) (PP (IN of) (NP (JJ such) (NNS towers)))))))) (, ,) (NP (NP (DT some) (ADJP (CD 12) (JJ m)) (PRN (-LRB- -LRB-) (NP (QP (CD 40) (CD ft))) (-RRB- -RRB-)) (NN high)) (CC and) (NP (CD 2.5) (NN m) (PRN (-LRB- -LRB-) (NP (QP (CD 8) (CD ft))) (-RRB- -RRB-))) (ADJP (JJ thick)) (, ,)) (VP (VBD were) (VP (VBN constructed) (PP (IN along) (NP (NP (DT the) (NN coast)) (PP (IN at) (NP (NP (DT the) (NN beginning)) (PP (IN of) (NP (DT the) (JJ 19th) (NN century))))))) (S (VP (TO to) (VP (VB guard) (PP (IN against) (NP (NN invasion))) (PP (IN by) (NP (NNP Napoleon)))))))) (. .)))
In total, seven towers were built along the coast, and tourists can visit all of them.
( ( In total ) ( , ( ( ( ( ( ( seven towers ) ( were ( built ( along ( the coast ) ) ) ) ) , ) and ) ( tourists ( can ( visit ( all ( of them ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NN total))) (, ,) (S (NP (CD seven) (NNS towers)) (VP (VBD were) (VP (VBN built) (PP (IN along) (NP (DT the) (NN coast)))))) (, ,) (CC and) (S (NP (NNS tourists)) (VP (MD can) (VP (VB visit) (NP (NP (DT all)) (PP (IN of) (NP (PRP them))))))) (. .)))