A bright little alley in La Boca is a part of tango history.

The true jewel of Africa's west coast known as "Africa's Last Eden."

The world's first and only natural nuclear reactor.

Abandoned ships along a deserted beach feel like the set of a post-apocalyptic thriller.

Did Gustav Eiffel design this enigmatic metal building?

The abandoned tanks along this highway are all that remain of a deadly conflict.

Landscape of bizarrely shaped desert mountains and innumerable rock carvings.

A fortress-like granary that has been continually in use for more than nine centuries.

Surrounded by a smudge of dark earth, this isolated volcano sits in stark contrast to the surrounding Sahara.

A deserted Bedouin village lines the shores of this stunning desert oasis.

This triumphal arch is the only fully standing structure that remains from Roman-era Oea.

Early Islamic mosque with several strange conical domes.

This crocodile-infested East Timor reservoir is also home to a spectacular half-sunken forest.

A haunting place that is now home to thousands of birds.

This giant Christ statue was a failed attempt by Indonesia to dissuade East Timor from demanding independence.

These sacred totem houses connect the Fatakulu people with the spirits of their ancestors.

No one is quite sure of the origins of these idyllic natural hot springs at an abandoned mountain resort.

The 20th-century archaeologist was interred among the ruins of an ancient Roman city.

A ghost village sits atop a mountain within Jordan’s largest biosphere reserve.

This ancient town is full of stunning Ottoman architecture and streets so narrow trash collection is done by donkey.

The remains of three different ancient civilizations have been found at this rich archaeological site.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.

A refurbished locomotive from a bygone era in the middle of the Jordanian desert.

This restored eighth-century palace is a shining example of ancient Umayyad architecture.