Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

A monumental cross hides in the trees in Golden Gate Park.

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.

An enormous illuminated figure dances on the Las Vegas strip.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

The most playful of the life-sized statues that make up Singapore's "People of the River."

A man-made island in scenic San Francisco Bay.

Final resting place for the Triangle Shirtwaist fire’s unidentified victims.

The capitol city's oldest existing cemetery.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The most visited, and possibly most controversial, museum in Germany.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The oldest working mechanical clock in the world.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Looming communist pillar with a Czech twist.

A battle between nature and architecture in the Cambodian jungle.

Turning night into day in Victorian-era Austin to thwart a serial killer.

The remains of the first saint from Alaska in the Russian Orthodox Church.

Go inside to really appreciate this 500-year-old technological masterpiece.

Ship-sized kinetic sculptural fantasy.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A clock designed to run with perfect accuracy for 10,000 years.