see this error in the console on your page, your site is denying iframe access to ivrpa.org domain, this would need to be fixed on your end
[Error] Refused to display 'https://360photoplus.com/wp-content/vt/Grand_Hotel/?html5=only&s=pano30' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN, SAMEORIGIN'.
sam