They got Hagia Sophia. Which when you think about it is probably the only structure on earth that comes close in awe and majesty.
There's the Ulm Minster -" Before the completion of Sagrada Familia in Barcelona, Spain, it is the tallest church in the world,[3] and the 4th tallest structure built before the 20th century, with a steeple measuring 161.5 metres (530 ft).[3]" https://en.wikipedia.org/wiki/Ulm_Minster
And there's the Cologne Cathedral -" It is Germany's most visited landmark, attracting an average of 20,000 people a day[6] and currently the tallest twin-spired church at 157 m (515 ft) tall. File:Kolnerdom-december2015.ogvPlay media (video) Cologne Cathedral in 2014 Construction of Cologne Cathedral commenced in 1248 and was halted in 1473, leaving it unfinished. Work restarted in the 19th century and was completed, to the original plan, in 1880.[7] The cathedral is the largest Gothic church in Northern Europe and has the second-tallest spires. The towers for its two huge spires give the cathedral the largest façade of any church in the world. The choir has the largest height to width ratio, 3.6:1, of any medieval church.[8]" https://en.wikipedia.org/wiki/Cologne_Cathedral