Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

The Los Angeles flood disaster that took 400 lives and ended the career of William Mulholland.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

One of the final concrete ships built before World War II is now a crumbling breakwater.

Along a California highway is a kind of Jurassic Park made of metal.

The humble gravesite of the man who failed to cash in on his Pepsi-cola goldmine.

Secluded amid upstate New York’s Adirondack Mountains lies this subterranean emblem of a nation on the brink of nuclear war. And it's for sale.

Hidden beneath the streets of London is a secret subway that only carried mail.

A lake in the middle of the tundra of Quebec is said to be the purest freshwater lake on Earth.

A town filled with hot chocolate, dazzling lights, and lots of Christmas cheer.

An Australian lake whose pink hue defies scientific explanation.

I Street Bridge is the heaviest swinging center bridge in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Remembering the Alamo with a full-scale replica of the 1836 city.

Site of the first pathological and bacteriological research facility in the United States.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

A haunting tribute to pioneering photographer Clover Adams.

38-story baroque tower reflecting Detroit's rise, fall, and possible rise again.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

The largest ancient burial mound in Ohio.

Home on the Hillside, and home of the first breakfast cereal.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

The largest underground church in Europe.

A marvel of Byzantine engineering under the streets of Istanbul.