An amazing example of early-20th-century architecture, this church features marble transported from Utah.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

The 28,000-year-old specimen is remarkably intact.

Every drop of D.C. tap water flows through this old waterworks.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

A super-sized promotional trick that is now a D.C. landmark.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

After over 100 years out of service this landmark windmill once again turns as a symbol of Jerusalem's self-sufficiency.

A sprawling ancient Jewish cemetery with over 30 rock-hewn burial caves.

A serene desert oasis speckled with ancient artifacts.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

The first memorial dedicated solely to the Black troops who fought for the Union.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.