Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

This miniature museum is home to a vast array of insects.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This derelict building used to house infirm Freemasons, their widows, and orphans.

The first pet cemetery in the United States.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

A unique collection of more than 250 rocks and minerals located on a university campus.

One was an astronomer who spent his life chasing solar eclipses, the other helped make Emily Dickinson famous.

This exhibit is one of the largest and most well-preserved collections of Jurassic-era trackways in the United States.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

A historic Black graveyard hidden in the parking lot of one of America's largest malls.

A layered tribute to the work of mosaicist Isaiah Zagar.

A sculptural commentary on capitalism pokes up from the East River.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

One of only two commuter aerial tramways in the United States.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

The first and only carousel with a lineup entirely of insects.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.