A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

Come for the waffles, stay for more waffles.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

These gardens recreate unique and endangered Michigan habitats.

This old estate is a remnant of when the Bronx was a popular summer destination for wealthy New Yorkers.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

The commemorative stone column conceals a secret laboratory.

The park is home to the United States's only still-operating Dutch windmill.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

One of the few working locomotive roundhouses in the United States.

Its columns were all carved from the same white oak tree.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

Its floors are marked by colorful cues depicting Michigan's native fauna.

This preserved wilderness hides the remains of a colonial grain mill used to feed George Washington's troops.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

Creating this diorama spurred naturalist Carl Akeley to begin advocating to protect the apes.