A unique look into the bowels of a century-old funicular.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

A 30-foot-high stream of chocolate flows continuously at the Lindt Home of Chocolate.

This former cigarette factory was built in a style inspired by Islamic architecture.

It's good luck to be mocked by this monkey.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

The model behind the iconic 3D test model.

This historic streetcar system has been running since the 19th-century.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

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

The stunning interior of this Gothic church is covered in ornate gold details.

A scientific observatory managed the largest Portuguese astronomy research unit.

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

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

A treasure trove of scientific instruments from the 17th and 18th centuries.

Switzerland's oldest public observatory is an important part of the Zurich cityscape.