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 historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

This natural "sea of stones" was once used by the Romans as a quarry.

The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

Fantastic views and thousands of love locks.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.