An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

1513 Turkish world map, full of European state secrets and snarky commentary.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

The final resting place of soldiers' loyal canine companions.

A sweet symbol marks the place where torturous executions were once carried out.

This historic national park is covered in the stunning ruins of red rock pueblos.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A mysterious spirit totem at the edge of Navajo lands.

A spiritual vortex among the red rocks in Sedona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

A Wild West jailhouse that slid down the mountainside.

A reproduction of earth's many biomes.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

The unusual burial monument of Arizona's first governor.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This abandoned horse racing track was an exercise in hubris from its inception.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.