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

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

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.

Flames have been burning within this mountain for more than 2,500 years.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

A circle stone within a stone circle.

This silent sentry in the crypt below a large Gothic cathedral is often knee-deep in water.

A genuine Little Shop of Horrors.

This ancient church, rebuilt at least 3 times, is flanked at all sides by history.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

What started as a way to address damp basement walls turned into a house filled with intricate hand-carved designs.

A little slice of Japan and its aesthetics in London's Holland Park.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

A well-studied colony of endangered bats roosts in this abandoned Victorian Gothic mansion.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

An elegant garden commemorating the 1841 visit from apostle and missionary, Orson Hyde.

An iconic view point of the Sea of Galilee offers a look into Israel's past.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

The view from this giant Stone Age toad is unexpectedly beautiful.

The largest stone circle in the world has ended up bringing up more questions than it has answered.