An eerie, protected forest of old-growth oak trees, many of which are now dead.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

This natural monument has an origin story steeped in legend.

Curious carved stones and bird-like wings are a symbol of Serbian resilience and freedom on the site of a WWII massacre.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

Tucked in an urban forest, this restaurant specializes in homemade, healing rakijas.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

A Serbian church lit by chandeliers made of weapons.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

Dedicated to the unsung history of human waste.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A spiral staircase twists to the top of this unusual Czech lookout tower.

This doorless 20th-century elevator doesn't stop or slow down.

On this Polish road, an optical illusion makes cars seem to roll uphill.

Brought to you by the makers of fiberglass dinosaurs.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.