The largest clown school in Britain offering accredited degrees.

An unassuming London park is actually a pilgrimage site for modern clowns.

This building contains a door only used by members of the royal family.

A unique collection of gilded age mechanical pianos.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

This sublime architectural marvel is a rare example of an expressionist church.

One of the most dazzling dioramas at the American Museum of Natural History is also one of the oldest.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

One thousand trees were planted in Norway to be used to print books a century from now.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Modern sundial uses ancient methods to tell time and date perfectly.

A trail of "Game of Thrones"-themed doors carved from fallen trees from the iconic Dark Hedges.

After years of slow decline, a derelict Gothic castle is now being restored to life.

The remnants of a strange stilted building on rails can still be seen at low tide.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

Outsider art meets paleontology at this roadside reptile repository.

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

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

The fences outside some of South London's estates are made from recycled World War II stretchers.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.