Historic medieval fortified city in southwest France.

An Antoni Gaudí masterpiece in Astorga.

This ruined travelers shelter sits abandoned in a desolate bog of Flow Country.

Britain's only herd of free-ranging reindeer.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

Five mysterious spheres in the wall of a church that puzzle Málaga’s locals.

A lovingly curated curio shop in which the taxidermy wear newspaper party hats, and peanut shells are spread across every surface.

This fantastical icy castle is built anew every winter.

Morocco's Argania trees are infested with nut-hungry goats.

Vast stretch of tide-pools with a unique Moroccan charm.

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

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

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

A totem pole of heads to represent the different stages of life.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

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

This South London cemetery holds the remains of more than 15,000 people.