The national park was once a plantation estate.

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

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Shop of curiosities with a dinosaur museum tucked in its basement.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This historic hotel invented the chocolate brownie.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.