During the rainy season, this temple is almost entirely submerged, accessible only by boat.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

An enigmatic modern marker left next to a historic Roman site.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

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

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

The celebrity luchadores of La Paz are tough ladies in traditional petticoats and braids.

What might look like a cliffside sacrificial altar at first glance is actually a stone compass pointing to cities and lighthouses all around the world.

A spiritual center in the Santa Monica Mountains founded by Alice Coltrane after the death of her husband and fellow jazz musician John Coltrane.

From under the bed of one of the co-founders, this server helped launch the notorious file-sharing website.

A once-luxurious, now abandoned hotel in the Italian Alps.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

A festival where people vie to be bombarded by exploding clusters of fireworks.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

An ancient artistic garden parlor full of hidden water wonders.

Ruins of a 10th century church tucked away deep in a botanical garden.

Da Vinci's equestrian statue, 500 years in the making.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.