A plaque memorializes the Boston location of one of the largest nightclub fires in history.

Three prestigious academic collections come together to create a world-class natural history museum.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

The classic Christmas carol was written at this Massachusetts tavern in 1850.

A stone marker commemorating the first time sound was transmitted over wires.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This king penguin is a knighted brigadier of the Norwegian Army.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

Elaborate tile work in this railway station tells the story of Portugal.

A cluster of granite granaries perched on stilts.

These narrow stone granaries have been used to store and dry out grain for hundreds of years.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

This castle has links to Portugal’s founding and struggles for independence.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

In a fusion of myth and mischief, this statue is a testament to this university's quest for both knowledge and pleasure

A replica of the Roman emperor in glorious full color.

A collection of historical engines and rolling stock from throughout Riga's rich railway history.

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.

Latvia’s first skyscraper, nicknamed ‘Stalin’s birthday cake.’

This enigmatic artifact remained buried in a churchyard for years.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A WWII museum that tries to reenact history.