A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Baroque celebration of the end of the Great Plague of Vienna.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Op-art architecture designed for happiness.

The topiary maze at the Habsburg hunting lodge.

Dine amidst exotic plants at this former royal greenhouse.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

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

The beautiful baroque library of the Hapsburg empire.

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

An artistic melting pot inside an old roadside inn from the Ottoman era.

This tower is all that remains of the mosque that once stood in the center of the city, before it was destroyed by fire in 1941.

Legends hold that these unusual rock formations were once a bridal party, or perhaps a group of hunters.

This building served as the first customs house in modern Greece.

This building was once the most magnificent mansion in Nafplio.

This church is dedicated to the patron saint of seafarers.

One of the most photographed locations in the entire city.

One of the best-preserved medieval streets in Europe.

Τhis feline monument commemorates fallen soldiers on a field that saw many, many battles.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

Dedicated to the god Dionysus, this theatre was used for both musical and theatrical performances.

This church combines Christian, Byzantine, and ancient Greek architectural elements.

This ancient structure appears Roman, but was constructed during the 16th century and was utilized until 1911.