A smaller model of the Da Vinci sculpture that took 500 years to come to life.

An exotic wildlife habitat right off The Strip.

Elvis's own personal tropical hideaway.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

This replica of the Greek structure is in the heart of Nashville.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A museum chronicling pioneer life constructed over Interstate 80.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

This dramatic rail curve was once the target of a failed Nazi attack.

Steepest flood safety railway in the entire world.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

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

Don't get it twisted: This is the oldest pretzel bakery in the United States.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

This elaborate towering structure was once famed for its revolutionary height.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The oldest surviving botanic garden in the United States.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

This constitutionally sound Muffler Man harkens back to the days these attractions were a must-see.