The house of a former Argentinian president stands protected within a large glass case.

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The celebrated eyesore created by starry-eyed sweethearts.

Catacombs turned marketplace.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A celebration of capitalism in Midtown.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Famously misunderstood wonder of the ancient world

Elevated freight railway turned wildly successful urban park.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

Two identical statues by Fernando Botero, one blown to pieces in a terrorist bombing, the other donated as a gift for peace.

The Andean town where every single building is decorated with a brightly colored frieze.

Former drug lord’s manor, now a theme park. Watch out for the hippos.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The only castle in North America to ever house European sovereigns.