Museums
IRA G. Ross Aerospace Museum
Contains interesting space and aviation artifacts, like the actual control panel used in one of the Apollo moon missions.
Daredevil's of Niagara Museum
An interesting museum about those who have tried to go over the falls both successfully and unsuccessfully. You can see some of the devices used, as well as other artifacts. They also have an IMAX theater show to learn more. Along with English, they also have showings in Japanese and French and audio sets available in other languages.
Waterfalls
Cave of the Winds
An elevator takes you down to a walkway that leads you right to the bottom of the Bridal Veil Falls. You will definitely get a feel for the true power of the falls! This is the closest you can get to the falls on either side without actually leaping into them! Ponchos and sandals are provided, and you will definitely need them.
Views of Niagara Falls are free and accessible. Access to the riverside walks and parks offer great views. You can walk across to Goat Island on the pedestrian bridge.
There are a number of attractions designed to give different experiences of the falls.