Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

This painted Lego bridge is the product of over a century of locomotive history.

The town of Argleton has a postal code and appears on maps and even real estate listings, yet it does not exist.

Priceless space junk on display in front of a local Dairy Queen.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Abandoned anti-ballistic missile base.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

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

A Victorian school for poverty stricken waifs has been preserved as a museum to their donated education.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

Folky pharmaceuticals abound in this medicinal reliquary.

Tour the sci-fi-esque reality of governmental disease management.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

When German-Iraqi relations broke down, this embassy was vacated post haste.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

These crumbling Latvian forts make for some haunting seaside ruins.

Wars fought and wars won are remembered by these abandoned bunker ruins.

This remote eatery and museum is preserved as a time capsule of a small Icelandic fishing town.

America's first public mental health facility.