Sponsored by Big Onion Walking tours.

Sponsored by Big Onion Walking Tours, Fee, $10: $8 for students and the elderly.

Sponsored by the museum and Big Onion Walking Tours.

Presented in conjunction with Big Onion Walking Tours.

Big Onion Walking Tours Fee is $9; students and those 62 and older, $7.

Sponsored by the Big Onion Walking Tour.

Big Onion's graduate historians are paid $50 a tour and say they find the occupation flexible enough to accommodate their academic schedules.

Big Onion Walking Tours is the largest walking tour company in New York City.

Big Onion provides primarily historical and literary walking tours, to show the sites not shown on "plaques".

Big Onion gives tours in two dozen neighborhoods and parks in Manhattan and Brooklyn 365 days a year, rain or shine.