A walk through the historic city center, under the streets of Seattle.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

Believe it or not, the now-ubiquitous California avocado originated in Guatemala.

This staircase full of Mayan hieroglyphics is perhaps the largest single text in the world.

This softball diamond has a culture all its own.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

Built to bless whalers before their voyages, this Massachusetts church now features a ship-shaped pulpit.

Historic seaside park featuring explorable, abandoned military structures.

A whimsical monument deep in this park commemorates the groups that helped build it.

A large camera obscura, constructed entirely from digitally fabricated components.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

Once the center of food production for this small town.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A formerly abandoned mental institute, now back in business.

Whale bones, scrimshaw, and sperm oil make up just a part of this comprehensive collection of whaling history.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

All that remains of a magnate's dream home is a historic gate and an abandoned public pool.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.