New York's only private park is open to the public only one day a year.

The only park from the 1930's is, of course, Wrigley.

Central Park is not the only park that's a dance center.

"That pier is the only park in the Clinton area."

"It's the only park in the area with such great equipment," he said.

It is the only historical national park in Europe.

It is the only park on the west side of Manhattan to have lighted ball fields.

It is the only floating national park of the world.

It is the only park of its kind in Andalusia.

Located in its boundaries is the city's only regional park.