2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Thousands of well-dressed mummies below a monastery.

Pompeii's less famous neighbor is still revealing her secrets.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A section of the long chain that blocked enemy ships from entering Constantinople.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Ancient serpentine sacrifice holder that has stood the test of time.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

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

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.

A marvel of Byzantine engineering under the streets of Istanbul.

An out-of-place slice of France, smack in the middle of Shanghai.

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

The ornate miniature mansions were built for Istanbul's feathered residents.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

A monument stands at one of the starting lines of the Trans-Canada Highway, formerly the longest uninterrupted highway in the world.