Rome's semi-secret peephole vista is also a former Crusader stronghold.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

A cluttered and astounding collection of antiquities and curiosities.

The palatial McDonald's that inspired Wesley Willis.

This historic hotel invented the chocolate brownie.

Peek through the gates at this oasis from the city, full of Old English charm.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Books you don’t need in a place you can’t find.

The site of Paul Revere's historic two lantern warning.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Giant, friendly pelicans in Central London, the most unlikely of places.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This historic mansion was built as a symbol of love between a husband and wife.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

A former major munitions plant that has been converted into a sprawling art space.