The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The last intact steam engine factory in the United States.

Constructed from bricks salvaged from a former dormitory destroyed in a fire.

In 1863, a woman buried her hard-drinking husband beneath his beloved booze.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

The eccentric mansion of one the most popular horror authors of modern times.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

This now-deactivated naval base defended the Florida coast for centuries.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

This giant fashion model is one of the most beloved symbols of Nagoya.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

The world's longest and deepest train tunnel.

The best place for scenic views of the DMZ and North Korea.

Secret North Korean passage discovered below the world's most dangerous border.

South Korea's largely symbolic, barely used gateway to the North.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

This WWII plane died a quiet death, and is now a garden eel playground.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The unbelievably opulent home built for an infamous newspaperman.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

A trading post in the North Pole where children send letters.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Home to more than 13,000 pieces of war memorabilia and military equipment.