An underground spring in a labyrinthine cave system, decorated with stalagmites and stalactites.

This Gothic revival structure has been a family home, a military base, a gymnastics center, and is now owned by one of the largest auction houses in Italy.

The biggest cave system in the Arabian Peninsula is home to a rare variety of blind fish.

A little Lego easter egg is hidden underwater in the Boston Tea Party tableau at Miniland.

Designed to not only to represent the history of the local community but also, the future.

A work of art that pays homage to a Victorian timepiece in Providence.

Large Massachusetts museum dedicated to Armenian history and culture.

This historic Victorian mansion is allegedly so haunted that a signed waiver is required to enter.

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

Plymouth's huge yet little-known memorial to the Pilgrims.

This old mill and former police station now present a world-class collection of Orthodox iconography.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

This unassuming Massachusetts residence was built with a trap door to hide escapees on the Underground Railroad.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

A collection of full-size movie monsters opened to the public.

Museum dedicated to awful artwork.

This stone in Lexington honors a formerly enslaved man who fought during the American Revolution.

The birthplace of the man who patented the cotton gin and pioneered interchangeable parts.

The oldest philatelic museum in the United States.

This penny stopped a bullet and saved a soldier’s life during the American Civil War.

Oldest church in the United States that is still in continuous use.