For your information: the old town of Nafplio is wheelchair accessible. The visit to the ancient theater of Epidaurus is possible for disables since your vehicle could drop you off exactly in front of the ancient theater, skipping the difficult staircase. The ancient site of Nemea is flat without steps, and the museum has a ramp. The site of Mycenae is accessible until the lion gate. The museum is all accessible. The toilets of these archeological sites are accessible for disables, too.