360° views of the city plus five floors of optical illusions and hands-on science.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

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

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

An unusual round church in London with a Templar past.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Read a book next to a Midtown waterfall.

Home to items never before seen by the public.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Stalactites and stalagmites in a beautifully lit cave.

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

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Explore 10 acres of environmental sculptures.