The old park was designed by the diarist John Evelyn, a noted landscape gardener and an expert on trees, with a canal, straight rides and avenues.
His designs for Euston included the walk through the pleasure grounds which can still be enjoyed today.
The whole park and river layout was designed by William Kent in 1738, and is considered one of his great works.
His temple and entrance archway survive.

Capability Brown worked at Euston intermittently from 1776 until his death in 1783.
He remodelled water features for 3rd Duke of Grafton, expanding Kent’s system of small lakes & rivulets into a large new lake, Broadwater, with a central island, designed to give views towards the house through trees.
He built a weir to direct water from River Blackbourne into the lake and may have landscaped the river bank in front of Euston Hall & along the river to the south, and planted trees by the lodges on the western boundary of the estate.

Euston's watermill was built in the 1670s by Sir Samuel Morland for irrigation and grinding corn.
In 1731, it was redesigned by William Kent to resemble a church, and in 1859 an iron waterwheel was added by Charles Burrell.

The Temple (not open to the public) is an unusual octagonal folly designed by William Kent in 1746.
It was his last work.
It has a magnificent octagonal banqueting hall rising to a dome.

The current house and grounds comprise about 110 acres of parkland and 65 acres of pleasure grounds.
The landscaping underwent major restoration work in advance of the Capability Brown tercentenary in 2016.
The old park was designed by the diarist John Evelyn, a noted landscape gardener and an expert on trees, with a canal, straight rides and avenues. His designs for Euston included the walk through the pleasure grounds which can still be enjoyed today. The whole park and river layout was designed by William Kent in 1738, and is considered one of his great works. His temple and entrance archway survive. 
Capability Brown worked at Euston intermittently from 1776 until his death in 1783. He remodelled water features for 3rd Duke of Grafton, expanding Kent’s system of small lakes & rivulets into a large new lake, Broadwater, with a central island, designed to give views towards the house through trees. He built a weir to direct water from River Blackbourne into the lake and may have landscaped the river bank in front of Euston Hall & along the river to the south, and planted trees by the lodges on the western boundary of the estate. 
Euston's watermill was built in the 1670s by Sir Samuel Morland for irrigation and grinding corn. In 1731, it was redesigned by William Kent to resemble a church, and in 1859 an iron waterwheel was added by Charles Burrell. 
The Temple (not open to the public) is an unusual octagonal folly designed by William Kent in 1746. It was his last work. It has a magnificent octagonal banqueting hall rising to a dome.
The current house and grounds comprise about 110 acres of parkland and 65 acres of pleasure grounds. The landscaping underwent major restoration work in advance of the Capability Brown tercentenary in 2016.
Euston Hall