This elaborate tunnel is the first structure composed of cast concrete in the United States.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

An eccentric playboy's astounding natural history collection.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

This graceful little figure is a one-of-a-kind version of the cherished character.