This sandwich shop has a century-old elevator behind a sheet of plexiglass.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Perhaps the most scandalous statue of America's first president.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

This grand gothic brewery has been pumping out suds for over a hundred years.

100 years later, they're still down there.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The school tested mustard gas for the U.S. Army during World War I.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

At 207 feet, one of the world's longest continuous escalators.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

A "miracle" that seems to produce more holy fistfights than holy revelations.

The home of the Dead Sea Scrolls is an abstract modernist dream.

The only quarter of the Old City not dedicated to a major world religion.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

This dome-shaped mountain boasts amazing views and has a rich religious history.

This enormous censer uses a pulley system installed over 400 years ago.