A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Amsterdam's former hotspot for public executions and dissections.

After being lost for decades, this striking mural depicting the atomic bomb covers the wall of a busy Tokyo metro station.

Japan's iconic sci-fi hero rendered to 8-bit by notorious French street artist Invader.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

Perhaps the most spectacular grotto along the Algarve coastline.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

A former reservoir that was only recently discovered after more than 60 years of disuse.

This World War II-era bunker is now packed with posters and props from movies and TV shows filmed nearby.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

Designed by a computer, this intricate network of fluorescent green pipes has taken over a subway station.

A 12th-century fortress containing some of Berlin's oldest buildings.

This quirky collection of furniture also happens to be a public art installation.

This unusual lava tube spouts seawater during high surf.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A manifestation of modernist architectural ideas, this massive, multi-purpose building was one of the first of its kind in Southeast Asia.

A ring of soy sauce bottle bases decorate an important Singaporean landmark.

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

Inside this metro station is a section of the city's former medieval fortification.

The location of the world's first telescope demonstration.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

A public urinal so pretty, it was declared a national monument.