Eccentric concrete mansion and museum designed and built by hand from the inside out.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

Now nearly dry, this lake is said to be the ancient home of the Lady of the Lake, and was once thought to be bottomless.

A fantastic castle rumored to be the birthplace of King Arthur.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

The "dragon babies" of southeastern Europe.

360° views of the city plus five floors of optical illusions and hands-on science.

A six-ton wedding present for the King of the Scots.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

Commemorating the spot where the famous scientist fed his pigeons.

The largest greenhouse in the world is home to over one million types of plants.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The United States Capitol's former columns still stand.

Art deco landmark on the outskirts of Washington, D.C.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The oldest working mechanical clock in the world.

Famously misunderstood wonder of the ancient world