One of the world's largest ancient burial mounds.

Largest graveyard in all of Japan surrounds a famous mausoleum.

A calico cat named Tama was the wildly popular Super Station Master at this train stop in southeast Japan.

A Japanese shrine to dolls.

The reconstruction of this prominent building fulfilled a long-written command.

These crumbling Latvian forts make for some haunting seaside ruins.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

The oldest continuously operating pharmacy in Europe.

This art shopping center still boasts pieces of its past as a textile factory.

Colonial architecture meets urban art in this sprawling open-air gallery.

This botanical garden boasts sculptures, industrial ruins, and an endorsement from the Dalai Lama.

Once a year, local students "clean" this statue with a champagne shower.

The enormous isokinetic structure hangs within a science center in Estonia.

Troublesome students were detained in this tiny graffiti-covered university jail.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

Considered one of the most haunted places in Europe, this 800-year-old castle was home to noble prisoners.

The Guardian of Tallinn.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.