Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

Real bones which are said to have belonged to a Polish dragon.

The silly symbol for an underground protest group is now scattered around the city.

An impressive monument to Poland's independence.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

An existential riddle in the world's largest ancient castle.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Mummified monks and the accidentally interred, in a 17th-century crypt.

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

A cheeky architectural easter egg.

Europe's second largest ossuary wasn't discovered until 2001.

This bone-filled cave got its name after they found 140 bear skeletons inside.

This Transylvanian church has changed its denomination four times.