A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

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

A memorial for public executions that dates back to the 14th century.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

These Victorian era devil sculptures were designed to spite a local vicar.

Order a salt beef-loaded beigel at any hour of the day or night at this East End institution.

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

The site of London’s first coffee house has been serving refreshments of one kind or another for 360 years.

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

Near the site where the English Archbishop was born, you can find an emblem in the shape of a pilgrim's badge.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

Since 1768, the pillar at Guildhall Market in Bath has been a hub of economic transactions.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Don't be fooled by this fake medieval facade even if it is almost 300 years old.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

This 1920s Dutch barge is now a floating bookstore.

This sculpture encompasses the emotion of rail travel.