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

Garments from across the globe call this hidden gem home.

One of the last mosaic tile facades found in the city.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

Where you can hail your favorite fictional commanders-in-chief.

The towering figures were created from the cemetery's fallen old-growth trees.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A nostalgic bibliographic gem.

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

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

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

An iconic view point of the Sea of Galilee offers a look into Israel's past.

A magical oasis in the middle of the Negev Desert.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

A modern-day cabinet of curiosities housed in a 300-year-old inn.

Hidden beneath a washing machine in a fake kibbutz, this secret bullet factory has been preserved as a museum.

A serene desert oasis speckled with ancient artifacts.

This subterranean funicular is one of the world's smallest subways.

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

Through a collection of modern bric-a-brac this museum tells the story of the Jewish people from Biblical times to today.

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