The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

The world's largest wooden structure.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Elevated freight railway turned wildly successful urban park.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A white oak with property rights.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

A unique sculpture park that specializes in the huge and bizarre.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

An Irish Memorial commemorating those who perished due to potato blight.

The first American axe throwing club.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.