Terrifying derelict military hospital once housed a recuperating Hitler.

A crumbling bakery where forced laborers from the nearby concentration camp toiled to feed their fellow prisoners and Nazi soldiers.

When this test site was abandoned, they didn't even bother to take the rocket with them.

Artists and musicians now rule over this former rail station.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

Remnants of a Victorian garden feature sitting in public woodland.

This South London cemetery holds the remains of more than 15,000 people.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

Massive crater in central Oregon.

A volcanic fissure over two miles long and up to 70 feet deep.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

Only known mainland rookery of the threatened Stellar sea lion.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

The longest continuous lava tube in Oregon.