Round door at Yu Garden, Shanghai. Cropped and slightly edited from a photo by almudena-stock on Deviant Art.
See the context in this spherical panorama by Low-Wee Heng.
Here’s where it is located.
Circular doors, especially when the lower part is open, resemble some Arab horseshoe arches:

Alfiz. By Owdki (Alfiz) CC BY-SA 2.0, via Wikimedia Commons.
And of course the blazing apex & gloria morphologies.
That Triumphal Arches and and church façades share this characteristics appears as no coincidence.

‘Façana del monestir de Sant Cugat del Vallès’, fotografia d’Heribert Mariezcurrena (~1878). Estampa núm. 8, acompanyada de text explicatiu, a l’Album Pintoresch-Monumental de Catalunya: aplech de vistas dels més notables monuments i paisatjes d’aquesta terra acompanyadas de descripcions y noticias históricas y de guias pera que sían fácilment visitats, publicat per l’Associació Catalanista d’Excursions Científiques el 1878. De disposició lliure al dipòsit digital de documents de la UAB. PD By Pedraferit.

Collection: A. D. White Architectural Photographs, Cornell University Library Accession Number: 15/5/3090.01615
Title: Barcelona. Triumphal Arch of the Exposition
Photographer: M. and Lévy, J. Léon (French photographic studio, active 1860-1880) Architect: Josep Vilaseca i Casanovas (Spanish, 1848-1910)
Arch date: 1888 Photograph date: ca. 1888-ca. 1901
Location: Europe: Spain; Barcelona
Materials: albumen print
Image: 11.0236 x 8.8583 in.; 28 x 22.5 cm
Provenance: Gift of Charles Mason Remey
Persistent URI: <a href=”http://library24.library.cornell.edu/collections/adw/80461-541.html” rel=”nofollow”>http://library24.library.cornell.edu/collections/adw/80461-541.html</a>
There are no known U.S. copyright restrictions on this image. The digital file is owned by the Cornell University Library which is making it freely available with the request that, when possible, the Library be credited as its source.