This narrow Ghent alleyway is an officially sanctioned street art tunnel.

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

Christ's blood allegedly preserved in a Belgian town.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

A collection of artifacts from Maryland's maritime past.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The oldest farmer's market in America is so ancient it was approved by the King of England.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The second oldest continuously operating bar in Louisiana.

The only rotating bar in New Orleans has been slowly spinning since 1949.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The final resting place of New Orleans' most famous voodoo priestess.

The rock on which Moll Dyer was found frozen to death is said to still bear her handprint.

Visitors flock to see this church tower's unintended feature: It happens to resemble a giant chicken from multiple points of view.

Dr Barnes' $25 billion private collection of art and arboretum.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.