A network of ancient Egyptian tombs built into the cliff face along the Nile.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

One of the most well-preserved temples of ancient Egypt.

Ancient Egyptian relief, claimed to depict an electrical light.

Some believe that this ancient mural depicts technology far ahead of its time, but in reality it's nothing quite out of place.

It might not be the prettiest pyramid in Egypt, but it may be the muddiest.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

In Egypt's expanding metro area, many of the neighbors are dead.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This spectacular track has run continuously since 1882.

These aggressively sustainable art homes look like something out of 1970's science fiction.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

What is the Thing?

A reproduction of earth's many biomes.

A Saint Nicholas-themed ghost town in the Mojave desert.

The ghost town that ended up on Ebay.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

One of the ghostly stops along Route 66.