An often overlooked ancient site in downtown Athens with substantial history (and nature).

A Byzantine-era church hidden in a wooded area below the Acropolis.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

Iceland's first pagan temple in 1,000 years is underway in Reykjavík.

An important landmark in the history of algebraic logic.

A stunning medieval castle owned and restored by the famed actor Jeremy Irons.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

The only quarter of the Old City not dedicated to a major world religion.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

An ancient quarry rediscovered by a dog and claimed by biblical kings, a German cult, and the Freemasons.

A meow-velous tribute to a beloved street cat, made famous on the internet.

A sixth-century Byzantine cistern hidden below a modern carpet store.

A fountain standing as a testament to a doomed alliance.

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

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

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

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.

The world's largest frame offers spectacular views of the city's past and present.

A unique configuration of blown glass can be found inside this hotel lobby.