This unique sculpture proved invaluable when it saved a train from careening off the tracks.

This residence straddles a border between Belgium and the Netherlands.

A memorial to the murdered Jews of Kaunas.

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

Launch site for nuclear war against Western Europe.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

A small monument in Lithuania marks the geographic center of Europe—or at least one of the claimants.

This mine is home to the largest man-made hole in Europe.

No need to strap in for a "ride" on this walkable roller coaster.

A two-inch thick solid brass rod that extends an astounding one kilometer straight into the earth.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

The site of one of the largest prison escapes of World War II.

One of only two places in the world where two rivers cross each other without the waters mixing.

The shattered remains of the world's once tallest structure.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

Special benches that play Chopin's music are scattered throughout his native city.

This bell stars in a tragic love tale and is said to make wishes come true.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.