Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

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

Three columns of volcanic rock shoot out of the ocean.

Erotic art covers the walls of the largest ancient pleasure palace.

Breathtaking and huge 430 year old maps of Italy.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The most visited, and possibly most controversial, museum in Germany.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Tiny memorials honor individual victims of the Holocaust.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A modest grave marks the final resting place of one of the world's most influential religious figures.