This Latvian shot factory is still used twice a year to manufacture bullets the old-fashioned way.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

An artful memorial to 4,000 fateful oranges.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

There is a mouldering Jewish cemetery hidden away in the capital of Moldova.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

When it comes to handsignals (and colonialism) rock always beats scissors.

A painfully obvious spy house sits right across the street from the Russian Embassy.

The most accurate timepiece in the world.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

The reconstruction of this prominent building fulfilled a long-written command.

This ducal residence was once home to a future Russian empress and a French king in exile.

Mysterious heaps of stones dot these otherworldly woods.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

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

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.

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.