An unusual sand beach in the middle of a forest.

A subterranean shelter remains intact under a busy Paris railway station.

A model train wonderland hidden beneath Gare de l'Est station.

Hike the ruins of a zoo that was shut down by an unsolved murder.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

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

An unusual round church in London with a Templar past.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

An incarceration museum on the spot of possibly the oldest prison in England.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

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

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

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

This coffee shop lies hidden beneath a historic church.

This black cat was actually designed to ward off bad luck.

England's most famous front door has an accidental doppelganger.

London's smallest police station is barely the size of a phone booth.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.