Where the lovelorn find a home for their sentimental keepsakes.

This 135-year-old weather station studied the effects of the climate on human health.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

A town's history displayed through a massive work of art.

An abandoned, desolate train tunnel that was used during World War II.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

Built as a training camp, this site became a detainment center for prisoners of war and German civilians during World War I.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

The mirrored section takes the shape of Hebrew characters when viewed from above.

Memorial to the victims of the Holocaust in Serbia.

Where the Border Reivers of the Johnstone clan used to hide their stolen cattle.

The most impressive of Basel's three remaining city gates.

A memorial to two dedicated postal workers who lost their lives delivering mail.

These mysterious religious carvings were once thought to be thousands of years old but are actually the work of modern eccentric.

Scotland still bears an enormous scar of its Roman past.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

A pair of connected skyscrapers form this symbolic gateway.

A museum dedicated to the former country.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This statue of the famed author, actor, and journalist is made entirely of screw-nuts.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A Serbian church lit by chandeliers made of weapons.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.