This man-made mound monument was built out of soil from all across the Polish empire.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

The site of the first battle of World War II.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Norway's oldest cathedral still in use.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This giant boulder is pinched over a 1000-meter abyss by two mountains.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

Over time, this castle grew to encompass the entire island.

These traffic lights celebrate the 100 year anniversary of the women's suffrage movement in Lithuania.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

This seaside pine grove features an exclusive watchtower that presents amazing views.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

The reconstruction of this prominent building fulfilled a long-written command.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

3,000 market stands in five former Zeppelin hangars.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.