A mysterious stone embedded at the base of a historic Boston building.

One woman’s obsession gave birth to this lovely oddity at the Boston Public Library.

Shelves covered in dozens of coffee bean varieties fill this North End institution.

No one messes with the Massachusetts sacred cod, not this time...

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

It's believed a castle existed at this site since the 12th century.

When this Iron Age bog body was discovered in 1835, it was thought that she had died recently.

This unique architectural wonder is home to luxury apartments.

A model memorial to the original Odin Tower, the second highest tower in Europe before it was sabotaged by Danish Nazis.

An artist has turned what most people would consider a bathroom nightmare into a work of political art.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Six beautiful wooden giants are hidden around Copenhagen.

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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A fascinating insight into daily life in the Eastern Bloc.

A surreal museum of extraordinary industrial objects.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

The clothes-washing king doubles as a community center with some unusual features, including an aviary filled with finches.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.