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.

This 600-year-old home seems to defy physics.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

A fantastic castle rumored to be the birthplace of King Arthur.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A neolithic dolmen that was rebuilt after collapsing during the 19th century.

Famously misunderstood wonder of the ancient world

This hilarious English intersection is an automotive whirlpool.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

A miniature village mimics the surrounding buildings so well it includes itself.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

This charming old building's loose connection with the Scottish Reformer is what saved it from demolition after it split apart.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A sweet symbol marks the place where torturous executions were once carried out.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A swath of France so devastated by war it is still forbidden to go there.

Site of one of World War I's most horrific scenes.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.