A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

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

Stepping inside this coffee shop is a journey through time.

The longest continuous lava tube in Oregon.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

At high tide this strange footbridge appears to have no purpose whatsoever.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

Visible below the waves are memorials to the city's Gold Rush dead.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A modern mechanical planetary system, part of a 10,000 year clock.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The United States Capitol's former columns still stand.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

An eerie, decaying ghost town destined to fade into the forest.

A derelict bit of transportation infrastructure hidden in the woods.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

Nature is leading a successful mutiny on this century-old freighter.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.