Vast castle complex with buildings revealing architecture from Roman-style to Gothic & 20th century.

18th-century summer palace with tours of lavish rococo ceremonial rooms, plus gardens with a maze.

Structure known as both Amer and Amber, with Hindu & Muslim elements & offering elephant rides.

Immense, 18th-century palace with gilded apartments, chandeliered Hall of Mirrors & fountain show.

Fortified hilltop castle, initiated in the 14th century & prettified in a variety of later styles.

Palace built in the form of a high wall to screen royal ladies as they watched street festivities.

18th-century, ridge-top palace for state occasions, plus tours with rooms full of art and antiques.

Centuries of bloody history around a medieval castle, home to Crown Jewels and iconic Beefeaters.

Turreted, 19th-century, hilltop castle built for King Ludwig II, with tours of furnished rooms.

Dramatic, 14th-century castle, former royal residence & alleged legend of Count Dracula inspiration.

An 11th-century castle and barracks housing the Crown Jewels and National War Museum of Scotland.

Circular, 2nd-century castle housing furniture & paintings collections in Renaissance apartments.

19th-century, Romanticist palace on a high rock & former monastery site, surrounded by parkland.

The palaces of 11 separate rulers sit together in this sprawling complex that was started in 1559.

Landmark Moorish royal palace with fountain-filled gardens, ornate arches & 16th-century tiles.

11th-century, hilltop Moorish castle & royal residence with palace ruins & archaeological museum.

Revered castle dating to 1597 & since rebuilt, featuring gardens & a museum with varied exhibits.

Grand, domed sultan's palace, now a museum, including collections of art, calligraphy and carpets.

Huge Medieval-Renaissance fortress with historical museums & art by da Vinci and Michelangelo.

This historic hilltop castle with views of Mexico City houses the National Museum of History.

14th-century Teutonic castle housing museum of medieval artifacts, paintings & an amber collection.

Built in 1782, this ornate royal palace complex now houses a museum & is open to visitors.

Elaborate fort built in 1734 in the hills above Jaipur, offering sweeping views of the city.

Neo-Renaissance residence of King Carol I with a museum of national heritage artifacts.

Massive seafront medieval fortress, once a papal seat, offering tours & cultural events.

Unique 13th-century castle surrounded by water, with steep climbs leading to scenic lake views.

Historic hilltop fort with a memorial for 17th-century emperors, plus a temple to the goddess Kali.

Palatial venue for the Hungarian National Gallery plus displays from Gothic altars to sculpture.

Early 20th century-built palace & gardens with underground passages, a chapel & museum, plus events.

Imposing hilltop fortress built in the 1600s with a complex tunnel system & offering audio tours.

Ruined, 16th-century, red sandstone castle on a hillside, with guided tours & a huge wine barrel.

Romantic medieval castle restored after fire with ornately decorated rooms & an armoury museum.

Expansive, 16th-century, former royal palace with multiple towers and cupolas, surrounded by a moat.

Tour the historic royal castle full of spectacular art & antiques, plus grounds & a chapel.

Reconstructed Baroque castle dating back to 907 A.D. & national museum located on a hilltop.

Elegant, chateau-style castle hosting guided tours, an art gallery, 2 restaurants and 3 hotels.

17th-century hilltop fortress & former prison, housing a military museum with impressive city views.

Iconic circa-1613 castle known for a white facade, plus towers, moats, passageways & cherry trees.

Reconstructed 14th-century palace with an art collection & guided tours of the royal apartments.

Papal palace, once rival to the Vatican, with 25 open rooms, frescoes & cultural events.

This ancient fortress sits atop a clifflike ridge overlooking the river & offers lush park areas.

Persian-style palaces with an opulent Durbar hall in lush grounds open for events & receptions.

City views spread from this hilltop, 9th-century Muslim castle with a history museum & guided tours.

Renaissance fortress rebuilt in the 19th century, with Gothic towers & a history museum.

Striking, 16th-century chateau spanning river, housing tapestry and Old Master paintings collection.

19th-century castle commissioned by an archduke, with a park with rare plants & panoramic views.

Ruins of towers, temples & reservoirs in a hilltop plateau complex accessible by a single path.

This restored castle originally completed in 1612 features artifacts & exhibits on the Edo Period.

A glass cube transports visitors up to this medieval castle with its permanent history exhibit.

Baroque-style royal palace with 3 museums & a vast library. Admission fee can include a guided tour.