This historic, palatial theater is now one of the world’s most beautiful bookstores.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

San Diego's most historic and haunted home.

A world-class observatory in the California desert.

Lucha Libre (Mexican Wrestling) themed taco shop.

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

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

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

A marvel of Byzantine engineering under the streets of Istanbul.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The most loyal of little dogs, or a Victorian era publicity stunt?

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

The ancient tomb acts as a calendar that keeps perfect time.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A building so large that it has its own weather.

Meet manatees face-to-face at this zoo for native species.

Quite simply the largest tree in the world (by volume).

This crumbling stump is all that remains of what was once thought to be the oldest living organism.