An important landmark in the history of algebraic logic.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

The oldest working mechanical clock in the world.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

A small village in two different countries.

One of few lasting examples of the brief octagon craze that developed into folly.

Smack in the midst of coal country, this collection provides a peoples' history of Appalachian miners' heritage.

A Seussian sculpture made of brass instruments.

Once home to Komodo dragons, this island dreamscape has a rare combination of white, pink, and black sand beaches.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

A remote hill on a stretch of country road where the laws of physics are defied... or so it seems.

A dark tunnel leads to a striking white crater that seems to be from another planet.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

This 2,700-year-old woman is the jewel of the Maidstone Museum's Egyptian collection.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.