Location: 355 Marcy Avenue, Brooklyn
Opened: 1862
Demolished: 1883
Current Status: New York Army National Guard
Nickname: n/a
Famed Tenants: Brooklyn Eckfords (1862-1872), New York Mutuals (1871-1876)

Inspired Copycats Iffy Neighborhood Multi-Sport Architectural Marvel

The oldest venue on this list, the Union Grounds opened during the Civil War and allegedly had the distinction of being the first baseball ground enclosed in a fence. Holy technology!