Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A brass and marble scale model of the solar system embedded in the concrete.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

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

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.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

Castro's communist ice cream mothership has been serving five-scoop "salads" for over 50 years.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

Thermal springs underneath the seabed provide the heat and bubbles for these beachside natural hot tubs.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Pivotal home of Nobel Prize winner Pablo Neruda.