Try not to get slimed in Tribeca.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

This haunting monument honors the victims of 9/11.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Amsterdam's former hotspot for public executions and dissections.

Colorful and chaotic stacked hotel in North Holland.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Atop this library is one of the most beautiful green spaces in Warsaw.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

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

This towering statue of Jesus provided internet to the surrounding area.

Relive a Polish uprising via an enormous, century-old cyclorama.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

Modern art commemorates one of the first military actions of World War II.

This Communist-era residential block is one of the longest residential building in Europe.

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

A small granite monument marks where the borders of three countries meet.

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

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

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

This fairytale medieval church in Poland originally spent centuries in Norway.