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

A memorial to the beloved brown bear that served in the Polish army during World War II.

An impressive monument to Poland's independence.

Medicinal spa created with the discharge from a geothermal energy plant.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

Surrounded by ash fields in Iceland, an impossibly verdant valley looks like something out of a fairytale.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Three columns of volcanic rock shoot out of the ocean.

The summer tourists on these cliffs are thousands of seabirds.

This wild explosion of color on a disused water tower tells the whimsical tale of a curious puffin.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A network of concealed passageways lies within a busy London Underground station.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

A brush maker used his factory to protect blind Jews from the Gestapo.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

Legend has it this historic port was a popular hideout and smuggling spot for pirates.

This former railroad bridge was named after the great river that once flowed below it.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This tiny home was originally a narrow alleyway.