The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The largest island on the great salt lake is home to curious creatures and strange stories.

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

Come for the speed, leave in love with the desert.

5,000 skulls in memorial to those killed by the Khmer Rouge.

Khmer Rouge's high security prison.

Home to more than 13,000 pieces of war memorabilia and military equipment.

Go inside to really appreciate this 500-year-old technological masterpiece.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

One of America's most historic homes also holds a startling literary legacy.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Oldest building in California still in use.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The celebrated eyesore created by starry-eyed sweethearts.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.