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

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

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

A little sculpture with a large wardrobe.

Christ's blood preserved in a Belgian town.

Theme park featuring miniature replicas of European monuments.

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

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

This kitschy tavern is also home to rare early editions of "Treasure Island."

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

An exotic wildlife habitat right off The Strip.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

Old Danish castle immortalized in Shakespeare's Hamlet.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Amsterdam's former hotspot for public executions and dissections.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”