A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This historic cemetery was inaccessible for several years due to dozens of land mines.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

This fresco-covered medieval monastery hangs from the side of a steep cliff.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

A curious cave church carved into the face of a cliff.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

Space-age monument to an early 20th-century uprising.

This remote church calls a tiny island its sanctuary.

One of the world’s best microminiaturist, Nicolaï Siadristy displays his lifetime of tiny creations in this museum.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

340-foot statue built to honour the Heroes of the Soviet Union.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

The deepest metro station in the world.

A quirky collection flush with information on commode culture from ancient times to modern day.

The largest collection of death masks in Ukraine.

An Art Nouveau building covered in animal gargoyles and grotesques.

A collection of miniature, symbolic sculptures hides in plain sight across Kyiv.

When you've got to go, you've got to go.

This underground transport hub doubles as an art gallery.