Iran's colorful terraces are a rare geological masterpiece.

A collection of pianos and more guaranteed to delight anyone interested in music history.

Why walk on this historical site when you can zoom down instead?

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

The ancient abodes are a testament to human ingenuity amid harsh climates.

The great Danube river starts here.

South Africa's postal service began with a letter left in a boot beneath this tree.

The angel of death appears to weep black tears at this grave marker.

Peek through a transparent pyramid and drink in the mountain made of books.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The world’s largest work of glass art hides in this stunning Taiwanese subway station.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

Perhaps the only prehistoric monument with its very own public bus stop.

Science meets wall art to highlight the beauty of famous mathematical equations.

Elaborate patterns adorn the city's disappearing traditional architecture.

Norway has built what may be the world's most beautiful public toilet.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

The beautiful baroque library of the Hapsburg empire.

The secret medieval communication system will whisk your words above the noise of the crowd.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.