An experimental forest at the foreground of arboreal science is also the canary in the coal mine for climate change.

Small Island off the coast of Greenland.

These eight mummies are the best-preserved human remains ever discovered in North America.

A surprisingly beautiful abandoned World War II military base in East Greenland.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

A little slice of Japan and its aesthetics in London's Holland Park.

The sign at the garden gate reads: “These Plants Can Kill.”

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

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

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

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A tongue-in-cheek arcade where the games are based on everyday life.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Eighty million natural history specimens call this gargantuan museum home.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

These fantastically named natural pools look like something out of a Scottish myth.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

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