This colonial town in Colombia sits around the largest stone paved square in South America.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

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

When it comes to handsignals (and colonialism) rock always beats scissors.

Commonly acknowledged as the only public monument to the Devil himself.

Sacred Buddhist home of some spiritual monkeys.

An exquisite Baroque church in Vienna's old town.

Dating back to the fourth century, it's the oldest Hindu temple still in use in the Kathmandu Valley.

One of the oldest temples in Ho Chi Minh City, dedicated to a deified Chinese military leader.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

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

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

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

An ancient Egyptian temple in the middle of Madrid, Spain.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.

The Habsburgs' royal collections of art and wonders.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Designed as a reminder of one of the darkest moments in Austrian history.

Baroque celebration of the end of the Great Plague of Vienna.