A Roman spa buried deep beneath the City of London.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Scattered throughout London are ancient remnants of the city's former bounding wall.

The television series' iconic giant foot was borrowed from this classical painting.

The final resting place to 300 Victorian-era pets hides inside the city park.

Hear the quietest sound from across the dome.

Rebuilt remains of a temple to Roman god Mithras.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Eighty million natural history specimens call this gargantuan museum home.

Hidden beneath the streets of London is a secret subway that only carried mail.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A beautiful display of nearly 50 bells crafted with a unique design and distinct sound.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

The oldest private art gallery in all of Hungary.

A collection of intricate sculptures so small they have to be seen through a microscope.