No one's quite sure why there's a metal megaphone bolted on two rocks in the middle of the Mojave Desert.

A former barn converted into a massive train diorama.

The location where the iconic movie character declared it was time to go home.

The first marker along the famous boundary.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Stand at the point where the two mightiest rivers in the United States converge.

These cinderblock farmhouses were actually World War II radar stations in disguise.

A Cold War secret surveillance tower used to spy on radio communications.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

Home to items never before seen by the public.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

This delightful attraction features over a dozen miniature train layouts which you can operate and interact with.

A charming monument to a very special dog.

This quirky museum has a collection of more than 15,000 bobblehead dolls.

This Little Rock legend has survived decades of rowdy crowds, three fires, and a zombie wedding.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A nuclear bunker built to shelter the politicians and important people of Scotland in case of nuclear attack.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

The two locations of this landmark ice cream shop scream pure Americana nostalgia.

Allegedly haunted by Walt Disney himself, this inconspicuous lamp is always kept lit in his honor.

This overlooked street light once served as a KGB dead letter box.