Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A layered tribute to the work of mosaicist Isaiah Zagar.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

An underground magnet for ever-changing street art.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Stalactites and stalagmites in a beautifully lit cave.

Take a drunken tour inside the world's largest known geode.

This frequently-photographed waterfall takes only a short hike to visit.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Tubing through a cave lit with glowworms is a magical underground experience.

Banksy gives themself artistic license with this piece of London street art.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An abandoned castle owned and ignored by Masons carries a cursed history.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.