Catacombs turned marketplace.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Tucked inside a South Bank bar is an epic expressionist chronicle of the 20th century.

The biggest drug trafficking passage between Mexico and the U.S.

An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

The mansion-like building is packed with Texas pride.

The world's tallest statue of an American hero.

The "world’s largest honky-tonk" also has its own indoor rodeo arena.

This strategically-placed fountain creates the magnificent illusion of mustangs galloping across a river.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

Just like the real 36th president of the United States, animatronic LBJ amuses visitors with jokes and stories.

255 feet of suds, scrubbers, and blow dryers.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

An emerald-green grotto just a short trip from Austin.

Perhaps the most obscure, simplistic Banksy installation found in Bristol or in the entire world.

Drink wine handed out through a window as part of an age-old tradition.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Famously misunderstood wonder of the ancient world

Banksy's image of a naked man dangling from the window of a sex health clinic.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.