Abandoned bull fighting ring, slowly falling apart in Uruguay.

A beautiful deserted greenhouse in the middle of a park.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

Race through the maze, get your name on the sign.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The final resting place of the great navigator, or maybe his brother.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The celebrated eyesore created by starry-eyed sweethearts.

Artworks by loners, prisoners and the criminally insane.

Baroque celebration of the end of the Great Plague of Vienna.

The mark of the Devil's horns on a marble column in Milan.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

The bomb-ravaged remains of of a colossal Neptune.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.