Located on 420 acres in the high desert, this spiritual center is dedicated to the "science of the future."

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

A short hike into the mountainside forest reveals a decaying 1890s town.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

Treehouse motel and treehouse-building school.

The largest permanent Monopoly board makes one of the longest games even bigger.

A haunted hill that supposedly defied gravity.

This glamorous old building is said to have inspired the Tower of Terror.

The oldest surviving synagogue in New York City is now a soaring art space.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

A very classy 1920s-era bar right in Grand Central Station.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

The trials and tribulations of marking Poe's grave.

A modernist landscape of water and sci-fi concrete.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

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

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Enormous lake at the bottom of a unique cave system.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.