An Amazonian hotel is the ultimate treehouse and provides stilt based accommodation.

America's post-nuclear-attack chambers of Congress.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.

This picturesque mansion has gone from opulent ruin to nature museum.

Ample proof that watery ends make for well-preserved, millenia-old mummies.

Home to items never before seen by the public.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

A rich history stashed behind an unassuming door in the heart of Gold Country.

This legendary city has been a tourist attraction for centuries.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

An obscure waterfall that looks like something out of a fantasy novel.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The remains of an entire Roman city can be explored in this interactive museum.

A once grand hotel is being retaken by the wilderness it once capitalized on.

The decaying remains of a ship whose captain mysteriously disappeared.

Where Nor'easters go to die.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Cold War missile launch site which has been converted to a public park.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A man-made island fort that has housed soldiers, scientists, and ravers.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.