Elevated freight railway turned wildly successful urban park.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A giant Troll lurks under one of Seattle's oldest bridges.

The world's only museum devoted to the wonders of fluorescence.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

These fantastically named natural pools look like something out of a Scottish myth.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

On Japan's Tashirojima Island, cats are king.

An eerie, derelict amusement park in Berlin.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

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

An exquisite tunnel of cascading flowers.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A kaleidoscopic warehouse-maze of handmade neon signs.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A huge musical instrument played by the ocean.

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