Stalactites and stalagmites in a beautifully lit cave.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Elevated freight railway turned wildly successful urban park.

Famously misunderstood wonder of the ancient world

Macabre astrological automaton clock dating to the late 1400s.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An unusual round church in London with a Templar past.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Fortified medieval tower house with lovely roof garden.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Vines grow up the metal bars in this public park created from an old machine factory.