The modern birthplace of Irish freedom.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The resting place for anonymous victims of the Danube's dark waters.

A spherical "micro-nation" in the heart of Vienna.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

A somber memorial at the site where hundreds of prisoners and civilians were executed in the aftermath of World War II.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

Where commuters walk through remnants of an ancient Greek necropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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 particularly disconcerting tribute to Irish martyrs.

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

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.