This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Ruins of a Carnegie family mansion on Cumberland Island.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Get up close to emus and ostriches, or buy their tasty meat.

View rare birds and interact with lemurs at this nonprofit run entirely by volunteers.

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

This semi-secret storybook hedge maze is also the oldest garden in the city.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Enjoy egg rolls and live music in a converted bank vault.

A 60-room castle constructed by a horse-racing heir.

You can spend the night as an honorary lighthouse keeper in this quaint, historic beacon.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Books bound in human skin and H. P. Lovecraft's letters are among a few of the treasures this library has to offer.

Unicorns, elephants, and bears, oh my!

A crumbling hospital from the 1850s on Roosevelt Island.

A terrific purveyor of natural history objects and curios.