The narrowest street in Paris.

A surrealist timepiece by the artist of melting clocks.

This watchtower once presided over the Berlin Wall.

The site where a plot to assassinate Hitler was planned—and its conspirators were executed—is now a powerful memorial to the German resistance during World War II.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

This unique architectural wonder is home to luxury apartments.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A pair of gigantic baby heads greet passengers at Atocha Station.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

After funding was cut for a memorial to the Danish author, the sculptor had his statue ceremonially lowered into the city harbor.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's oldest Hindu temple.

The most playful of the life-sized statues that make up Singapore's "People of the River."

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Singapore's landscaping project is home to 18 incredible Supertrees.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

The last Viking king of Denmark is buried inside the crypt of this cathedral.

This ordinary street was made infamous by a legendary visit from the devil.

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

Site of the first radio and telephone broadcasting companies in Copenhagen.

Hans Christian Andersen for the postmodern world.