Tucked among the sand dunes overlooking a Welsh beach, a real-life tribute to a fictional elf.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

An 18th century monument regularly tagged with unsettling graffiti referencing a 1940s unsolved murder.

The grave of the legendary "Bonzo" can often be seen covered in cymbals and drumsticks.

Quaint, disturbing, and macabre objects are all on display at this intriguing collection of medical instruments from bygone eras.

An unusual round church in London with a Templar past.

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

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

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

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

London's amazing modernist public square that never was.

The commemorative stone column conceals a secret laboratory.

Paris' linguistic guide to the international language of, yes, love.

According to legend, this tomb holds the secrets to time travel.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

This peeling mural of Adam and Eve was inspired by the greenhouses at Kew Gardens.

An unassuming London park is actually a pilgrimage site for modern clowns.

A statue of the original Pearly King is hidden in a church's crypt.

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

This 15th century pub is one of only two pubs in England situated on consecrated ground.

This crumbling headstone commemorates the first death by tiger in Britain's history.