A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

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.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

Ozymandias’ time-keeping temple.

The largest known Ancient Egyptian obelisk.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

Slum Settlement Filled With Mountains of Garbage.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

A man throwing a giant severed hand towers over Antwerp’s main square.

An open-air sewer system that was covered piece-by-piece over 300 years.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

Amsterdam's former hotspot for public executions and dissections.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.