Marvel of green building techniques that sings with the wind.

Two small chapels housed inside an ancient tree.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Hundreds of hidden passageways weave through the old quarters of Lyon.

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

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

Ozymandias’ time-keeping temple.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Founded in 670, this ancient mosque is an architectural time portal.

These Finnish rapids have been attracting tourists for over a hundred years and are now released with the push of a button.

A subterranean house of worship carved right out of the bedrock.

This elaborate temple was built around one of the Buddha's teeth.

An ancient stone fortress considered by many to be the eighth wonder of the world.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Monasteries on rock pillars, once accessible only by frayed ropes.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

The world's second-largest sundial, made entirely out of stone.

Temples adorned with intricate, erotic sculptures make up one of the "seven wonders" of India.

Sacred Buddhist home of some spiritual monkeys.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

The Uros people live on floating reed islands in lake Titicaca.

The oldest stone house in Paris was built by its most famous alchemist.