Bombed and burned, this monument represents the often controversial ties between Vietnam and Cambodia.

A secluded, little-known temple hidden amid the dense jungle.

Khmer Rouge's high security prison.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

This 19th-century Turkish bath house survived the Blitz of London and is now an events venue.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

Collection dedicated to brands, packaging and advertising.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

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

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

The site of the first battle of World War II.

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

This antique thermometer honors the creator of the first universal temperature scale.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

Hundreds of notes give thanks to the patron saint of lost causes.

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

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.

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

The last king of Poland was interred in this church nearly 200 years after his death.

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

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.