The National Aquarium in Baltimore is having a “Pay What You Want Day” on January 11, 2015.

It is valid in person only, on site, from 9am-5pm at the National Aquarium in Baltimore, located at 501 East Pratt Street, Baltimore, MD 21202.

When guests choose their own admission price, proceeds support the National Aquarium Animal Rescue, the Aquarium’s harbor rehabilitation projects, as well as their youth education programs.

Guests can add a 4D Immersion film for an additional $5 to their admission price.

Regular admission prices are: Adult (ages 12-64): $34.95, Child (ages 3-11): $21.95, Senior (ages 65+): $29.95, Infant (Under 3 years old): Free!

Learn more at aqua.org, the National Aquarium in Baltimore’s website. Here are more details about the event on Sunday.