A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

A fitting attraction for the corn capital of the world.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

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

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The land is home to swimming ponies and a legendary 18th-century treasure.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Yo, Adrian!

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

In which a local geological marvel becomes a quaint roadside attraction.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

Once America's tallest structure, now a Baltimore landmark.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Home to items never before seen by the public.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.