Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Catacombs turned marketplace.

This 1920s Dutch barge is now a floating bookstore.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Sites connected to a woman born on a ship and spared by a pirate.

Inside this old mill is a collection of images that will always remain frozen in time.

The house where Rudyard Kipling wrote the Jungle Book is also the location of the first tennis court in Vermont.

The Boston home of a conductor on the Underground Railroad.

When Azorean green tea meets volcanic hot springs water, a luminous brew is born.

Connecticut's shot tower is near the end of its life.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Where the line between entertainment and aerospace blurs.

The last of its kind in the country.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

Exact replica of the ancient monument, but much, much lighter.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

The final resting place of a space program monolith.

This abandoned amusement park was built on a site with a dark history.

A small storefront museum explores the history and myth of West Virginia's famous urban legend.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

An original apothecary from 1792.