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Obscuration and confusion conspire to limit our knowledge of the inner MilkyWay. Even at moderate distances, the identification of stellar systems becomescompounded by the extremely high density of background sources. Here we providea very revealing example of these complications by unveiling a large, massive,young cluster in the Sagittarius arm that has escaped detection until nowdespite containing more than 30 stars brighter than $G=13$. By combining GaiaDR2 astrometry, Gaia and 2MASS photometry and optical spectroscopy, we findthat the new cluster, which we name Valparaiso~1, located at $\sim2.3\:$kpc, isabout 75~Ma old and includes a large complement of evolved stars, among whichwe highlight the 4~d classical Cepheid CM~Sct and an M-type giant that probablyrepresents the first detection of an AGB star in a Galactic young open cluster.Although strong differential reddening renders accurate parameter determinationunfeasible with the current dataset, direct comparison to clusters of similarage suggests that Valparaiso~1 was born as one of the most massive clusters inthe Solar Neighbourhood, with an initial mass close to $10^{4}\:$M$_{\odot}$.

A massive open cluster hiding in full sight