The most decorated dog of World War I is preserved in the Smithsonian.

The walls of the iconic dome are hollow and have a secret stairway.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

The rodent-shaped sidewalk imprint that earned worldwide media attention.

This once rural mansion now sits in the heart of the city.

A brick-paved former section of the historic coast-to-coast highway.

In 1952, this restaurant began selling the Colonel's “secret” recipe.

Visitors to this library are in for a real-world education in modernist architecture.

This coffee shop lies hidden beneath a historic church.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

An enigmatic monument to the Irish revolutionary who plotted an uprising against British rule.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

A particularly disconcerting tribute to Irish martyrs.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The most visited, and possibly most controversial, museum in Germany.

Since 1920, one small company has defined the distinctive chairs of Paris' sidewalk bistros.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Ancient paintings known as the "Sistine Chapel of Cave Art."

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.