Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

The home of possibly the least-loved U.S. president stands as a sort of unpopular Monticello.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Political activist and writer Thomas Paine once lodged at this location.

Where the famed frontiersman was born, raised, and survived Quaker intrigue

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

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

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

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A glittering Thai Buddhist temple in suburban Pennsylvania.

These lush botanical gardens employ the most purrfect pest control force.

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

A daily replay of the experiment that proved the rotation of the Earth.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

This jail which was in service for over a century is now open for curious visitors.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

The oldest farmer's market in America is so ancient it was approved by the King of England.

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

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.