Much of the four hectares of land in the surrounding estate consists of a densely treed park lined with myriad roads and footpaths. The woods are neatly arranged in the lower parts of the estate, but are left wild and disorganised in the upper parts, reflecting Carvalho Monteiro's belief in
primitivism. Decorative, symbolic, and lively structures can be found throughout the park. Image:Regaleira bridge.JPG|
Gazebo on the ornate bridge over the lower gate. Image:Regaleira bench 1.JPG|Bench between the lake and the Loggia. Image:Regaleira bench 2.JPG|Bench between the lake and the Ibis Fountain. Image:Regaleira bench 3.JPG|Bench between the chapel and the palace.
Tunnels The park also contains an extensive and enigmatic system of tunnels, which have multiple entry points that include: grottoes, the chapel, Waterfall Lake, and "Leda's Cave," which lies beneath the Regaleira Tower. The "Initiation Well" (see next section) connects to other tunnels via a series of underground walkways. Image:Palacio-da-Regaleira Gruta-do-Labirinto1 Sintra Set-07.jpg|Entrance to the Labyrinthic Grotto. Image:Palacio-da-Regaleira Gruta-do-Labirinto3 Sintra Set-07.jpg|The Labyrinthic Grotto seen from the lake. Image:Quinta da Regaleira, Sintra, Portugal, 2019-05-25, DD 53.jpg|Tunnel starting from the Eastern Grotto. Image:Palacio-da-Regaleira Gruta-da-Leda Sintra Set-07.jpg|Leda's Cave.
Initiation Wells The
Initiation Wells — also called
initiatic wells or
inverted towers — are two well-like shafts on the property that resemble underground towers lined with stairs. These "wells" never served as water sources, but rather were constructed for ceremonial purposes. The tunnels described above connect these shafts to one another, in addition to various caves and other monuments located around the park. Of the two shafts, the larger one contains a 27-metre spiral staircase with 23 small niches on the side. The nine flights of stairs could be linked to the
Knights Templar, which had nine founders. At the bottom of the shaft is an inland stone compass with the Templar cross. The smaller shaft contains straight stairs that connect a series of ring-shaped floors to one another. This shaft is also called the 'Unfinished Well'. Image:Fisheye-hemi-hemi initiation well.jpg|Bottom of the Initiation well. Image:View down the Well.jpg|Looking down the Initiation well. Image:Viewing the sky from the bottom of the initiation wel.jpg|View upwards from the bottom of the Initiation well. Image:Rain in the Initiation Well.jpg|Rain down the Initiation well.
Lakes, fountains, and the aquarium Bodies of water can be found in several places in the park. Two artificial lakes and several fountains were added by Monteiro. One of the most interesting and extravagant among them is the Aquarium, built as if it were naturally embedded in a large boulder. It was once considered the most important naturalist property in Regaleira. However, the Aquarium is no longer used and is poorly maintained. File:Regaleira Ibis Fountain.JPG|The Ibis Fountain. File:Regaleira Fount of Abundance.JPG|The Fount of Abundance. File:Quinta da Regaleira, Sintra, Portugal, 2019-05-25, DD 45.jpg|The Waterfall Lake as seen from the Terrace of the Celestial Worlds. ==In popular culture ==