  We use the largest open clusters catalogue in the post-Gaia era to provide
the observational view of the Galactic disk. By compiling the physical
parameters like age, distance, and kinematic information, we investigate the
spatial distribution of the open clusters and revisit the spiral arms and other
asymmetries in the Galactic disk. Using the young open clusters as a tracer of
spiral arms, we map the spiral structure of the Galaxy and found that most of
the clusters start migrating away from the spiral arms in about 10-20 Myr and
fill the inter-arm regions as their age progress. Using the 3D kinematic
information of 371 open star clusters, we derived different individual pattern
speeds for spiral arms closely following the Milky Way rotation curve, hence
favouring the transient nature of Milky Way spiral arms. The pattern rotation
speeds of each spiral arm suggest that the spiral arms have not accelerated in
the last 80 Myrs. Based on the distribution of open clusters younger than 700
Myr above or below the Galactic plane, we found a Solar offset of $z_\odot =
17.0\pm0.9$ pc north of the Galactic plane and estimated the scale height $z_h
= 91.7 \pm 1.9$ pc from the Galactic plane.
