A lush indoor jungle fills this bustling Madrid transportation hub.

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

A giant floating rubber duck-bunny painted with a different design every year.

These planks were originally installed to hold the dead.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A subterranean playground in an abandoned slate mine.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Pop culture has helped to keep this iconic British building from being destroyed.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

The western face was supposedly left clock-less to snub the Welsh.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

A mysterious demonic figure peers down from its perch within the gorgeous Chester Cathedral.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

Huge winged monument in the United Kingdom.