Be careful not to get trampled at this lively two thousand-year-old market.

The closest thing to Mars on Earth.

Home to Hollywood history and a very special salt crystal.

The world's first and only natural nuclear reactor.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

A modern mechanical planetary system, part of a 10,000 year clock.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

A huge musical instrument played by the ocean.

Rippling sand dunes frozen in the Arizona rock.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The mounds at this site were reconstructed with the help of archaeologists and historians.

The largest earthwork effigy in the world.

This New England drive-in was built to straddle the border between two states.

A beautiful maze marks where three countries meet.

America's second-oldest brick baseball stadium was home to a legendary WWII series that only sailors got to see.

There are eight natural springs around town, each with a slightly different taste.

This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

This mysterious petroglyph evokes the ancient swastika symbol but was later vandalized with the more troublesome Nazi one.

This California tree is the single source of the state's entire orange industry.

The site of murders and Satanic cult gatherings.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Huge otherworldly domed rocks on the shore of a deadly lake.

At this deceptively beautiful beach, nothing is what it seems.

Burping, gurgling geothermal mud pots by the Salton Sea.