The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

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

Akureyri is home to an oversized can of one of Iceland's favourite beers.

The Arctic Circle runs through this isolated spot north of Iceland.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

A winding, blood-red tunnel of hardened lava navigable by foot.

A tiny racehorse graveyard in the middle of a quiet Kansas City suburb.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A private collection of massive steel monsters guarding a Texas pipe works.

Floating pink tap installed for a flower show in London.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

London's old-school healing garden.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.