This former Masonic lodge has been transformed into part museum, part bar, all awesome.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

The remnants of an early American attempt at missile defense.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This abandoned Belgian fortress is purposefully being left to nature.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

French commune at the heart of conspiracies.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

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.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

You would never guess that before World War II this lonely field was a bustling German city.

The abandoned military base looks like a post-apocalyptic wasteland.

The last planned Soviet city was built for the former residents of Pripyat after the Chernobyl disaster.

This Estonian watchtower looks like a big tree with two giant bird nests on it, complete with a "golden egg."

This little gem in the Gulf of Riga has a very rich heritage and distinct culture.

It's rumored this unique Baltic beacon was designed by Gustave Eiffel himself.

Historic slum of Tartu.

A wooden statue of an Estonian pagan god and King of the Setos stands atop a sacred hill.

This stoic bronze soldier stands as a symbol of Russian sacrifice or Soviet oppression, or maybe both.

A wooden replica of France's famous tower.

Hundreds of unusual wheel crosses poke above the earth in this small Estonian cemetery.