This colonial mansion has been home to a staggering number of American historic figures.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Hidden behind an empty field resides this early 19th-century cemetery.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

Destructive children, start your engines.

A glittering Thai Buddhist temple in suburban Pennsylvania.

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

The first partially complete dinosaur skeleton was discovered here, forever changing the world's view of the ruling reptiles.

The final resting place of one of the United States's greatest poets.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The oldest surviving botanic garden in the United States.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

The farming museum contains an extensive taxidermy collection, including the world's largest stuffed horse.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Wedged between two sets of row houses is an awkwardly located family graveyard.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

One woman’s obsession gave birth to this lovely oddity at the Boston Public Library.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

The former locus of Boston's high culture has been shuttered and buried for over 70 years.