Inaugurated three times, this tower offers some of the best views of Madrid.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

This Volcano-like rest area was designed by architect Giulio Ceppi built according to energy efficiency and ecological footprint standards.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

This monument sits at the foot of a mountain from which legend says enslaved people jumped to their deaths.

This small group of sand dunes manages to pack in a strange rainbow of colors.

The “Thumb” of Mauritius provides a 360 degree view of the entire country.

This lavish 20th-century casino adorns labels for San Pellegrino water.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

A haven for book enthusiasts across the street from Retiro Park.

Despite the name, this ancient piece of crystal may not have been a lens at all.

This small chapel built into rock is the oldest place of worship in Luxembourg.

One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

The longest staircase lock in Britain.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

The grave of the famous painter is marked by a simple stone in the ground.

A totem pole of heads to represent the different stages of life.

A plaque on the base of this statue holds a bewitching design.

This little sun pays homage to a massive gate that once stood at this location.

This modernist bridge highlights the bear as a symbol of Madrid.

The oldest Anglican church in Southeast Asia.

One of the oldest and largest wooden churches in France was very evidently constructed by shipbuilders.

Germany's longest suspension rope bridge.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.