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.

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

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

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

A shrine in Karachi is home to around 100 crocodiles that are regarded as sacred.

Tibetan-influenced mountain fortress in Northern Pakistan.

The Great Wall of Sindh, Pakistan's mighty fort.

Thousands of ancient rock carvings are scattered just off the highway.

The third largest ship breaking yard in the world has created an eerie shipping graveyard in southern Pakistan.

A tower built by an emperor for an antelope.

One of the last surviving ancient Buddhist sites in the region, it escaped the brunt of several Hun invasions thanks to its remote location.

Massive fortress bastions in the desert of Cholistan.

This grand Pakistani mausoleum can only be accessed via an almost 1,000 foot long alleyway.

These stairs were built to accommodate royals mounted on elephants.

This lost city belongs to one of the earliest civilizations in the world.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

Reputedly haunted sandstone necropolis with exquisite stone carvings.

The world's northernmost botanic garden has 25 collections of plants from arctic and alpine regions.

At this Arctic outpost, get to know members of the indigenous Sámi community and meet their herds.