Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

This historic London residence was once the womb of Scientology.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

This enormous sculpture honors an English town's engineering and industrial heritage

This aging storage facility is the world's largest brick warehouse.

Most of Britain's gold reserve was secretly stashed here after the start of World War II.

This massive memorial commemorates those who died in the Manchester Arena bombing.

Remnants of a forgotten 1920s speakeasy and Prohibition-era murals were discovered in its basement.

The fake World Cup prize was secretly created after the first one was stolen in 1966.

This giant sculpture made of trash is a critique of society's wastefulness.

These engineering masterpieces are a dominant feature of the Belfast skyline.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

The medieval woodcut-style artwork chronicles life in medieval London.

The tower was originally used as a chimney for the waste incinerator of St Johns Precinct and Market.

Every year locals tumble 650 feet down to the bottom of the hill chasing a Double Gloucester cheese.