A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Experience a charming 1930's version of "infotainment."

This massive airship factory is so large that it has its own indoor weather.

In northern Ohio, the glorious past of America's trains is on full display.

The only presidential monument to display a late POTUS's actual casket.

The largest ancient burial mound in Ohio.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

There are more than 4 million bricks inside this unofficial Lego museum in a former middle school.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

The footprint of a frustrated devil in Munich's Cathedral.

It houses the remains of a 17th-century version of the Titanic.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The world's oldest continuously operating airport was founded by the Wright Brothers.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.