Yes, most hotel bookings are refundable provided that you cancel prior to the hotel's cancellation deadline, which is often 24 or 48 hours before the scheduled arrival. If you booked a non-refundable reservation, it might still be possible to cancel it and be given a refund within a 24-hour period of booking. Plug in your dates, click on "Search", then you can filter by "fully refundable" to get the top deals on offer near National Museum of the Navy.