An unusual collection of self-made musical instruments and unique noises.

Perhaps the tiniest sculpture in Saint Petersburg is a little bronze finch inspired by a song.

An abandoned 14th-century castle and prison complex on a small island in the Neva River.

UNESCO-protected ancient burial ground.

An homage to the medieval rulers of Bulgaria.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

A striking symbol of the Bulgarian capital.

This historic black and white monastery is one of Bulgaria's architectural jewels.

This doorless 20th-century elevator doesn't stop or slow down.

A tiny traditional village keeps an ancient method of beekeeping alive.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Constructed thousands of years ago, these stone circles offer incredible insight into the lives of the people who built them.

A strange tribute to all the fallen souls of war.

Modern Japanese museum is buried by snow annually.

Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

Be a ninja - or just act like one.

We heard you like volcanoes so we put a volcano in your volcano so you can die for sure...

A tiny cafe that recreates the Japanese elementary school lunch experience.

Peace Park and the Atomic Bomb Dome.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.