An American ghost town hides along a side street in Scotland's capital.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

This series of Scottish caves has no clear purpose other than baffling historians.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Journey through a mesmerizing array of board games inside this museum.

Designed as a reminder of one of the darkest moments in Austrian history.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

The resting place for anonymous victims of the Danube's dark waters.

This cubist Vienna church building looks like some sort of alien stonehenge.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Op-art architecture designed for happiness.

Dine amidst exotic plants at this former royal greenhouse.

An unassuming Swiss institution houses Europe's largest toy museum.

This ossuary is more than five centuries old and is heralded as one of the finest in Switzerland.

A rare, flower-shaped example of Brutalist architecture in Switzerland.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

Where Mary Shelley’s 'Frankenstein' and John William Polidori's 'The Vampyre' were born.

Artworks by loners, prisoners and the criminally insane.

Museum dedicated to wax representations of disfiguring diseases.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.