In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

One of Ireland's most infamous prisons for rebels including men, women and children.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

The last bastion of Roman presence north of the Alps looms over a German town.

Go inside to really appreciate this 500-year-old technological masterpiece.

2300-year-old Roman road connecting the empire.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This ancient theater was once the home of fierce gladiatorial battles.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A Gothic cathedral created from volcanic rocks.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The many—66 to be exact—faces of the German forest.

A strip of modern stores in historic buildings.

Some of the earliest leaders of the Moravian congregation are buried here.