A popular rock that acted as a waymarker for American pioneers.

Visit the monolithic tomb of America's most famous general.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

An annual extravaganza of Broadway theater memorabilia.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Visitors to this library are in for a real-world education in modernist architecture.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An empty mine that some believe will suddenly be filled with fortune and treasures at the end of the world.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

This granite monument at the site of an ill-conceived tourist attraction is built from the same stone as the Mormon Temple.

Pyramid home to an obscure religious group that practices modern mummification.

This giant ice cream cone is the last remaining icon of a Salt Lake City staple.

A stoic rock cairn is all that remains to remember one of the more brutal instances of frontier treachery in American history.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

A tunnel with windows, so you don't miss out on the impressive views.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

An off-the-beaten path cave with an underground lake.