A hidden courtyard houses early 20th-century plaster masterpieces.

A magnificent, reportedly haunted mansion built for a composer by Spiritualists.

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.

A small section of Boise, Idaho maintains the unique culture and traditions of the Basque people.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

The national park was once a plantation estate.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

This mom-and-pop Japanese sweets shop has been serving cloud-light mochi for almost a century.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

Peek through the gates at this oasis from the city, full of Old English charm.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The "Seinfeld" diner.

A dilapidated dock tells the story of Titanic's missed arrival.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Try not to get slimed in Tribeca.