One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

The site of Paul Revere's historic two lantern warning.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Radical Bookstore and Community Space.

In this brilliant blue spring in Germany, legend has it that a sad mermaid learned to finally laugh.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

The prison where Hitler wrote "Mein Kampf," and 278 Nazis were later executed for war crimes.

Four-story slides send people whizzing through the math department at this Munich university.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

A stunning two-story timepiece within a medieval Brick Gothic church.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

A Nazi concentration camp and Anne Frank's place of death.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

Hamburgers are intensely proud of their tunnel beneath the river.

This enchanting mountain plateau celebrates spooky local folklore.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

An industrial relic is now one of Europe's most staggering art spaces.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

Thousands of flowers create enchanting pink tunnels over the city streets.