The fairy tale castle of the "fairy-tale king."

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

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

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

The world's first motel is now an administrative building for an apple farm.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

An Art Nouveau building covered in animal gargoyles and grotesques.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

In one of the world's smallest countries, a royal's personal winery is open to the public.

The southernmost outpost of the Russian Empire in colonial America.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.