Collapsing castle on the Hudson river was once the storage site of military surplus business.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Beijing's version of Disneyland, completely abandoned, mostly destroyed.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

Fortified medieval tower house with lovely roof garden.

Started as a kitchen garden, now the second largest botanical garden in the world.

400-year-old garden, restored to beauty.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Most famous work of one of Frank Lloyd Wright's sons.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an eighth-century Buddhist master.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The stoutest tree in the world.

The restored and active Victorian-era final resting place of San Francisco.

An extraordinary final resting place full of oversized art, amazing statues, and dead celebrities.

The third-tallest statue in the world depicts the "Buddha of Infinite Light," complete with observation deck in his chest.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

An eerie, derelict amusement park in Berlin.

A clear example of the process of erosion in action.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A chapel on a volcanic core, marking the end of a successful journey.

An enormous park-like oasis, full of famous Chicagoans' graves.