A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

An overlooked memorial honoring the local Washington residents who died in World War I.

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

In the early 1800s, surgery was also a show.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

Three prestigious academic collections come together to create a world-class natural history museum.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

A men’s restroom became a sandwich shop.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Located in the historic home of a newspaper publisher, this museum is dedicated to the Freedom of Speech.

This massive solar system model is sprawled out across Maine's suburban wilderness.

This historic Victorian hotel has a scandalous history of affairs and murder.

A monument stands at one of the starting lines of the Trans-Canada Highway, formerly the longest uninterrupted highway in the world.

The New Central Library is a masterpiece of contemporary architecture in the midst of downtown Calgary.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

A black cottonwood gets a second life as a home for books.

This gold-winged spire celebrates the first true flight around the world.

A colorful hidden village of the fair folk.

An extraordinary mixture of natural beauty and man-made phenomena.

The largest wooden building in the world now houses a fascinating collection of aircraft.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This natural marble cave is one of only five national monuments in Oregon.