The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This 16th-century monastery has been turned into a surrealist architecture compound.

An ornate tower shows off a local artist's architectural flair.

A historic arboretum and non-conformist, non-denominational park cemetery.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

One of the world's most complex timepieces.

There has been an astronomical clock on this spot since the 14th century.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

One of the largest caves in the world open to the public.

A miniature train-ride through Slovenia's largest cave system.

This massive subterranean fissure is known as the "underground Grand Canyon."

The "Prussian Versailles" that is as glorious today as when it was built.

Modern sundial uses ancient methods to tell time and date perfectly.

This collection of solar timekeepers includes the world's first digital sundial.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The world's largest maze is a nature park with nearly 200 decision points.

The longest hedge maze in the world.

A striking 12th-century-style castle built on the edge of a cliff.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

An underground city of salt.

France's national museum of scientific and industrial instruments.