I think you can go to Europe with a little bit of planning. I have rheumatoid arthritis but was determined to travel. I booked hostels ( you probably can't do that) right in the centre of the Old Town sometimes on the old town square so was able to walk to see much of the architecture museums and churches. I could return to my hostel when i got tired. I travelled in the of season so was often the only person staying in the hostel.