The topiary maze at the Habsburg hunting lodge.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

Visiting this café is like visiting the Austrian grandma you wish you had.

The beautiful baroque library of the Hapsburg empire.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

This beautiful Croatian fortress is haunted by legends of forbidden love.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

During World War II, this rice mill became a Nazi concentration camp.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Dine on Hungarian-Jewish dishes at this multigenerational, family-run institution.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

Time stands still at this serene burial ground in the center of Budapest.

This massive subterranean fissure is known as the "underground Grand Canyon."

Inside this small chapel tucked away in the forest is one of the most well-preserved Danse Macabre frescos.

This museum is dedicated to the little known ancient Roman history of Vienna.

A miniature train-ride through Slovenia's largest cave system.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.