There’s a hidden military meme engraved on the World War II Memorial.

Home to items never before seen by the public.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

It was once the base for a series of domestic terror attacks.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Continuing the tradition of the dime museum in style.

The 40-foot-tall votive candle is the largest of its kind.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

These boots are made for selfies.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

See where Bill Murray kidnapped a hapless Punxsutawney Phil.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Ever wanted to can Spam?

This massive roadside mascot was the first version of the giant to illustrate his butt.

The highest point in Iowa, while not that impressive to mountain states, has earned its own monuments.

A fitting attraction for the corn capital of the world.

Just a man taking his prehistoric pet for a stroll.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

One of the first intercontinental ballistic missile sites in the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.