Press 1 for knock-knock jokes.

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

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

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

Atop this media building, two hives containing more than 30,000 bees keep the surrounding area vibrant.

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

Mysterious installations bring levity and light to a sometimes stodgy city.

The National Park Service’s best-kept secret with views that rival any in D.C.

Sip creative cocktails in the former vault of the Riggs Bank.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

This shop for all your super spy needs hides an educational secret.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

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

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

A lush green oasis in the middle of Chicago.

A Bibliophile's Dream.

An unlikely Transcendental Meditation haven in the American Heartland built around the ancient Vedic principles of balance and harmony.

The oldest university museum west of the Mississippi retains its 19th century feel.