Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

A sacred lake with thousands of sacred carp and a biblical history.

The ancient abodes are a testament to human ingenuity amid harsh climates.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Mausoleum and Holy Seat of Antiochus I of Commagene.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

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

This famous city eluded concrete detection until the early 2000's.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

These winged Maya figures are the subject of speculation and conspiracies.

An island graveyard with spectacular views of the Caribbean.

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

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

The word "Watergate" will forever be associated with the infamous scandal in 1972, but this fountain is famous in its own right.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

Washington's iconic carousel has a nice piece of Civil Rights history.

The "lovely red Vega" of the legendary record-settling pilot.

Decades before the scandal, this staircase on the river was a literal "water gate."

A nostalgic bibliographic gem.