This church on a Tohono O'Odham reservation has stood since 1797.

New York's transit system peddles terrible food in limited windows—this restaurant is a rare exception.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The Hudson River School comes alive at this palatial estate.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

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

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A mysterious echo seems to defy the laws of acoustics.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

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

One man's swirling six-acre monument of stone.

100 massive sculptures in the Hudson River Valley.

For more than 25 years, this Philadelphia store has been offering a wide selection of Victorian oddities and antiques.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

A terrific purveyor of natural history objects and curios.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The life-size bronze statue commemorates the ride of 16-year-old American Revolutionary War hero.