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

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

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

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

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A recently-abandoned international exhibition center.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

Only known mainland rookery of the threatened Stellar sea lion.

On the Oregon coast is a natural hole that seems to be draining the sea.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

A massive sea stack famous for its appearance in The Goonies.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Northern Ireland's Brobdingnagian stepping stones.

This decommissioned DC-3 now forever points into the oncoming wind.

Home to a full cast of the largest woolly mammoth ever recovered in North America. 

This tiny square mile of Canadian sand was once considered the world's smallest desert.

Roadside collection of 65,000 signs.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.