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

Canyon walls shrouded in ferns.

An eclectic trailer park retreat in the middle of the California desert.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

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

A celebration of capitalism in Midtown.

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

Eons old volcanic activity created one of the most stunning rock formations in the United States.

A legendary speakeasy bookstore returns from the brink.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This spa theme park lets its guests take a dip in pools of coffee, wine, or ramen broth.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

The angel of death appears to weep black tears at this grave marker.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

The intriguing personal collection of a professional demon-chaser.

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

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A house filled to the brim with oddities and curiosities.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The trials and tribulations of marking Poe's grave.

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