Scattered throughout London are ancient remnants of the city's former bounding wall.

The curios of pharmacist and collector Henry Wellcome.

A quiet memorial to those who died saving others in the heart of the City of London.

An unusual round church in London with a Templar past.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

The anatomical-pathological collection of a man who changed surgery.

The remains of the great moral philosopher reside in a university in London.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

If they push on just the right spot, even the weakest person can move this titanic boulder.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

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

Three columns of volcanic rock shoot out of the ocean.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This stunning concert hall has become a symbol of Iceland's national recovery.

A sulfuric martian landscape that looks far better than it smells.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

This elegant arc of a waterfall marks a religious turning point.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Ancient mysterious ruts carved in the bedrock.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Huge winged monument in the United Kingdom.

A church that bred legends, and served as an inspiration for the Da Vinci Code.