A massive collection of petroglyphs dating back some 40,000 years.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

In oil-rich Azerbaijan, people bathe in the black stuff.

A gigantic collection of teeny, tiny books.

A quirky house created entirely out of glass bottles combines a collector's spirit with an artist's flair.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.

The luxurious circular mansion built for a Communist leader now lies abandoned.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

An obelisk marks the spot where a British explorer's heart was buried before the rest of his body was transported to England.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

This wildlife trust is dedicated to orphaned elephant rescue and conservation.

The farmhouse owned by the Danish author who wrote "Out of Africa" is now a museum honoring her legacy.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

Stay in your own little bubble.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.