These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Giant topiary dog once played a role in a terrorist bomb plot.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A subterranean house of worship carved right out of the bedrock.

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

The oldest continuously operating pharmacy in Europe.

This 16th-century cemetery became a recreational park during the Soviet occupation—today it's a little bit of both.

The Guardian of Tallinn.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

This former Nazi labor camp is now a poignant memorial, complete with giant Soviet-style monuments.

This enigmatic artifact remained buried in a churchyard for years.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

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.

Elvis's own personal tropical hideaway.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

Where the U.S. government kept its actual treasure, before Fort Knox.

New York's southernmost subway station is whimsically wavy.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This innocent-looking townhome is actually a subway exit.

After the state would not recreate this beloved rock formation, three New Hampshire brothers took things into their own hands.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.