Trostburg castle was probably built in the 12th century, though nothing is known of its early history. At some point in the 12th or early 13th century a junior line moved a short distance away and built Liebegg Castle near Gränichen. On 28 May 1241 Burkhart I of Trostberg and his relative Ludwig of Liebegg appear in a document as witnesses and unfree knights in service to the Counts of Kyburg. Eventually they passed from Kyburg service to Habsburg service. In 1317 a knight named Rudolf von Trostberg was the Habsburg vogt at Kyburg Castle.
Around the mid-14th century the Trostburg line died out. The castle and surrounding estates were inherited by the Lords of Rinach. In 1415 the city-state of Bern conquered the Aargau from the Habsburgs. The owner of the castle, Hans Rudolf von Rinach, kept his castle and lands, but was forced to accept Bernese authority and grant them a preeminent right to buy it. In 1486 the Schultheiss and council of Bern decided to sell Trostburg along with its lands and serfs to Hans von Hallwil, the victor of the Battle of Murten.
Under the Hallwil family, the castle was fortified and expanded with a chapel and residence hall (known as the Hallwil House) added on the northwest side of the site. It remained with the Hallwil family for 130 years. In 1616 Hugo von Hallwil moved to Bohemia and tried to sell the castle to the city of Brugg. Apparently fearing that Brugg was expanding its influence, the city of Bern quickly bought the castle and then sold it to a cooperative of wealthy Bernese citizens. Bern retained the rights to high justice and some income, which they transferred to Lenzburg Castle. Over the following century the castle fell into ruin except for the Hallwil House. In 1754 it was described as looking like a peasant's hovel.
In the 19th century found the castle converted into a music box factory. In the early 20th century it was partly rebuilt by a German butcher, but World War I prevented project completion. A large part of the western curtain wall collapsed in 1922. In 1933 it was acquired by another private owner who used the castle as his private residence. An archeological project in 1999 explored the history of the castle and also repaired and strengthened many of the walls.
The castle is located on the same line of hills on which Liebegg Castle stands and the remaining castle walls wrap around the local hill top. The bergfried is a square 6.6 meters on each side and about 7 meters tall. The hill falls away from the tower toward the north, with a courtyard south and west. West and north of the courtyard the ground slopes down toward the Hallwil House. The residence building is four stories tall with massive walls that are between 1–1.7 m thick.References:
The Palazzo Colonna is a palatial block of buildings built in part over ruins of an old Roman Serapeum, and has belonged to the prestigious Colonna family for over twenty generations.
The first part of the palace dates from the 13th century, and tradition holds that the building hosted Dante in his visit to Rome. The first documentary mention notes that the property hosted Cardinal Giovanni and Giacomo Colonna in the 13th century. It was also home to Cardinal Oddone Colonna before he ascended to the papacy as Martin V (1417–1431).
With his passing, the palace was sacked during feuds, and the main property passed into the hands of the Della Rovere family. It returned to the Colonna family when Marcantonio I Colonna married Lucrezia Gara Franciotti Della Rovere, the niece of pope Julius II. The Colonna"s alliance to the Habsburg power, likely protected the palace from looting during the Sack of Rome (1527).
Starting with Filippo Colonna (1578–1639) many changes have refurbished and create a unitary complex around a central garden. Architects including Girolamo Rainaldi and Paolo Marucelli labored on specific projects. Only in the 17th and 18th centuries were the main facades completed. Much of this design was completed by Antonio del Grande (including the grand gallery), and Girolamo Fontana (decoration of gallery). In the 18th century, the long low facade designed by Nicola Michetti with later additions by Paolo Posi with taller corner blocks (facing Piazza Apostoli) was constructed recalls earlier structures resembling a fortification.
The main gallery (completed 1703) and the masterful Colonna art collection was acquired after 1650 by both the cardinal Girolamo I Colonna and his nephew the Connestabile Lorenzo Onofrio Colonna and includes works by Lorenzo Monaco, Domenico Ghirlandaio, Palma the Elder, Salviati, Bronzino, Tintoretto, Pietro da Cortona, Annibale Carracci (painting of The Beaneater), Guercino, Francesco Albani, Muziano and Guido Reni. Ceiling frescoes by Filippo Gherardi, Giovanni Coli, Sebastiano Ricci, and Giuseppe Bartolomeo Chiari celebrate the role of Marcantonio II Colonna in the battle of Lepanto (1571). The gallery is open to the public on Saturday mornings.
The older wing of the complex known as the Princess Isabelle"s apartments, but once housing Martin V"s library and palace, contains frescoes by Pinturicchio, Antonio Tempesta, Crescenzio Onofri, Giacinto Gimignani, and Carlo Cesi. It contains a collection of landscapes and genre scenes by painters like Gaspard Dughet, Caspar Van Wittel (Vanvitelli), and Jan Brueghel the Elder.
Along with the possessions of the Doria-Pamphilij and Pallavacini-Rospigliosi families, this is one of the largest private art collections in Rome.