This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Rising from the sea like a stone monster.

Staves, storm-calling, and of course, necropants.

Medicinal spa created with the discharge from a geothermal energy plant.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

This secluded walkway overlooks a magnificently wild London green space.

A Roman spa buried deep beneath the City of London.

This religious museum resides in a church crypt next to the founder's house.

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

This museum inside a museum tells the story of London's timepieces.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

Black cat statues guard this temple-like Egyptian revival factory.

Murals of the wild parties once held on the frozen River Thames.

The taxidermied remains of a once-great parrot.

Museum dedicated to the UK's first charity for abandoned children, with keepsakes of the mothers who left them behind.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.