One of the oldest student jails in Germany.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

A sharp sculpture made of thousands of pieces of jagged glass.

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

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.