Yes, the very famous [Prambanan temple at Java, Indonesia](https://en.wikipedia.org/wiki/Prambanan). This very old temple (and UNESCO world heritage site) from 9th century is dedicated to the trimurti. There are three temples, one for each Brahma, Vishnu and Maheshwara, there. Also, there are separate temples for their vahanas as well. 


[![Image of the temple from Wikipedia][1]][1]

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The [Thripaya_Trimurti_Temple at Thrissur, India](https://en.wikipedia.org/wiki/Thripaya_Trimurti_Temple) is another temple dedicated to trimurti. Here, the three deities are worshipped at once, as they are all placed on the same pedestal. 

> Thripaya Trimurti Temple is a Hindu temple in Irinjalakuda, Thrissur in Kerala, India. It is the only temple in the world where the Trimurti sit in one pedestal in one sanctum sanctorum. 

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As [@NogShine](https://hinduism.stackexchange.com/users/5212/sarvabhouma) mentioned in [chat](https://chat.stackexchange.com/transcript/message/42413816#42413816), the [Mithrananthapuram Trimurti Temple at Thiruvananthapuram, Kerala](https://en.wikipedia.org/wiki/Mithrananthapuram_Trimurti_Temple)  is also another place where the trimurti are worshipped together. 

  [1]: https://i.sstatic.net/jZgJi.jpg